18 files changed, 7288 insertions, 0 deletions
diff --git a/src/lib/stats/Makefile.am b/src/lib/stats/Makefile.am
new file mode 100644
index 0000000..018d787
--- /dev/null
+++ b/src/lib/stats/Makefile.am
@@ -0,0 +1,28 @@
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diff --git a/src/lib/stats/Makefile.in b/src/lib/stats/Makefile.in
new file mode 100644
index 0000000..8929292
--- /dev/null
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+	for dir in "$(DESTDIR)$(libdir)" "$(DESTDIR)$(libkea_stats_includedir)"; do \
+	  test -z "$$dir" || $(MKDIR_P) "$$dir"; \
+	done
+install: install-recursive
+install-exec: install-exec-recursive
+install-data: install-data-recursive
+uninstall: uninstall-recursive
+
+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libLTLIBRARIES clean-libtool \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/libkea_stats_la-context.Plo
+	-rm -f ./$(DEPDIR)/libkea_stats_la-observation.Plo
+	-rm -f ./$(DEPDIR)/libkea_stats_la-stats_mgr.Plo
+	-rm -f Makefile
+distclean-am: clean-am distclean-compile distclean-generic \
+	distclean-tags
+
+dvi: dvi-recursive
+
+dvi-am:
+
+html: html-recursive
+
+html-am:
+
+info: info-recursive
+
+info-am:
+
+install-data-am: install-libkea_stats_includeHEADERS
+
+install-dvi: install-dvi-recursive
+
+install-dvi-am:
+
+install-exec-am: install-libLTLIBRARIES
+
+install-html: install-html-recursive
+
+install-html-am:
+
+install-info: install-info-recursive
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-recursive
+
+install-pdf-am:
+
+install-ps: install-ps-recursive
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-recursive
+		-rm -f ./$(DEPDIR)/libkea_stats_la-context.Plo
+	-rm -f ./$(DEPDIR)/libkea_stats_la-observation.Plo
+	-rm -f ./$(DEPDIR)/libkea_stats_la-stats_mgr.Plo
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-recursive
+
+mostlyclean-am: mostlyclean-compile mostlyclean-generic \
+	mostlyclean-libtool
+
+pdf: pdf-recursive
+
+pdf-am:
+
+ps: ps-recursive
+
+ps-am:
+
+uninstall-am: uninstall-libLTLIBRARIES \
+	uninstall-libkea_stats_includeHEADERS
+
+.MAKE: $(am__recursive_targets) install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-am clean clean-generic \
+	clean-libLTLIBRARIES clean-libtool cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-libLTLIBRARIES \
+	install-libkea_stats_includeHEADERS install-man install-pdf \
+	install-pdf-am install-ps install-ps-am install-strip \
+	installcheck installcheck-am installdirs installdirs-am \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-compile mostlyclean-generic mostlyclean-libtool \
+	pdf pdf-am ps ps-am tags tags-am uninstall uninstall-am \
+	uninstall-libLTLIBRARIES uninstall-libkea_stats_includeHEADERS
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/stats/context.cc b/src/lib/stats/context.cc
new file mode 100644
index 0000000..697b3de
--- /dev/null
+++ b/src/lib/stats/context.cc
@@ -0,0 +1,99 @@
+// Copyright (C) 2015-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <stats/context.h>
+#include <util/multi_threading_mgr.h>
+#include <map>
+
+using namespace std;
+using namespace isc::data;
+using namespace isc::util;
+
+namespace isc {
+namespace stats {
+
+ObservationPtr
+StatContext::get(const std::string& name) const {
+    auto obs = stats_.find(name);
+    if (obs != stats_.end()) {
+        return (obs->second);
+    }
+    return (ObservationPtr());
+}
+
+void
+StatContext::add(const ObservationPtr& obs) {
+    auto existing = stats_.find(obs->getName());
+    if (existing == stats_.end()) {
+        stats_.insert(make_pair(obs->getName() ,obs));
+    } else {
+        isc_throw(DuplicateStat, "Statistic named " << obs->getName()
+                  << " already exists.");
+    }
+}
+
+bool
+StatContext::del(const std::string& name) {
+    auto obs = stats_.find(name);
+    if (obs != stats_.end()) {
+        stats_.erase(obs);
+        return (true);
+    }
+    return (false);
+}
+
+size_t
+StatContext::size() {
+    return (stats_.size());
+}
+
+void
+StatContext::clear() {
+    stats_.clear();
+}
+
+void
+StatContext::resetAll() {
+    // Let's iterate over all stored statistics...
+    for (auto s : stats_) {
+        // ... and reset each statistic.
+        s.second->reset();
+    }
+}
+
+ConstElementPtr
+StatContext::getAll() const {
+    ElementPtr map = Element::createMap(); // a map
+    // Let's iterate over all stored statistics...
+    for (auto s : stats_) {
+        // ... and add each of them to the map.
+        map->set(s.first, s.second->getJSON());
+    }
+    return (map);
+}
+
+void
+StatContext::setMaxSampleCountAll(uint32_t max_samples) {
+    // Let's iterate over all stored statistics...
+    for (auto s : stats_) {
+        // ... and set count limit for each statistic.
+        s.second->setMaxSampleCount(max_samples);
+    }
+}
+
+void
+StatContext::setMaxSampleAgeAll(const StatsDuration& duration) {
+    // Let's iterate over all stored statistics...
+    for (auto s : stats_) {
+        // ... and set duration limit for each statistic.
+        s.second->setMaxSampleAge(duration);
+    }
+}
+
+}  // namespace stats
+}  // namespace isc
diff --git a/src/lib/stats/context.h b/src/lib/stats/context.h
new file mode 100644
index 0000000..117872f
--- /dev/null
+++ b/src/lib/stats/context.h
@@ -0,0 +1,90 @@
+// Copyright (C) 2015-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef CONTEXT_H
+#define CONTEXT_H
+
+#include <stats/observation.h>
+#include <boost/shared_ptr.hpp>
+#include <mutex>
+#include <string>
+
+namespace isc {
+namespace stats {
+
+/// @brief Exception indicating that a given statistic is duplicated.
+class DuplicateStat : public Exception {
+public:
+    DuplicateStat(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) {}
+};
+
+/// @brief Statistics context
+///
+/// Statistics context is essentially a container used to group statistics
+/// related to a given context together. Two examples of such contexts are
+/// all statistics related to a given subnet or all statistics related to a
+/// given network interface.
+struct StatContext {
+public:
+
+    /// @brief Attempts to get an observation
+    ///
+    /// @param name name of the statistic
+    /// @return appropriate Observation object (or NULL)
+    ObservationPtr get(const std::string& name) const;
+
+    /// @brief Adds a new observation
+    ///
+    /// @param obs observation to be added
+    /// @throw DuplicateStat if an observation with the same name exists already
+    void add(const ObservationPtr& obs);
+
+    /// @brief Attempts to delete an observation
+    ///
+    /// @param name name of the observation to be deleted
+    /// @return true if successful, false if no such statistic was found
+    bool del(const std::string& name);
+
+    /// @brief Returns the number of observations
+    ///
+    /// @return the number of observations
+    size_t size();
+
+    /// @brief Removes all observations
+    void clear();
+
+    /// @brief Resets all observations
+    void resetAll();
+
+    /// @brief Sets max sample count for all observations
+    ///
+    /// @param max_samples value to be set for all observations
+    void setMaxSampleCountAll(uint32_t max_samples);
+
+    /// @brief Sets duration for all observations
+    ///
+    /// @param duration value to be set for all observations
+    void setMaxSampleAgeAll(const StatsDuration& duration);
+
+    /// @brief Returns a map with all observations
+    ///
+    /// @return map with all observations
+    isc::data::ConstElementPtr getAll() const;
+
+private:
+
+    /// @brief Statistics container
+    std::map<std::string, ObservationPtr> stats_;
+};
+
+/// @brief Pointer to the statistics context
+typedef boost::shared_ptr<StatContext> StatContextPtr;
+
+};
+};
+
+#endif // CONTEXT_H
diff --git a/src/lib/stats/observation.cc b/src/lib/stats/observation.cc
new file mode 100644
index 0000000..034f2b9
--- /dev/null
+++ b/src/lib/stats/observation.cc
@@ -0,0 +1,568 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <stats/observation.h>
+#include <util/chrono_time_utils.h>
+#include <cc/data.h>
+
+#include <chrono>
+#include <utility>
+
+using namespace std;
+using namespace std::chrono;
+using namespace isc::data;
+using namespace isc::util;
+
+namespace isc {
+namespace stats {
+
+std::pair<bool, uint32_t>
+Observation::default_max_sample_count_ = std::make_pair(true, 20);
+
+std::pair<bool, StatsDuration>
+Observation::default_max_sample_age_ =
+    std::make_pair(false, StatsDuration::zero());
+
+Observation::Observation(const std::string& name, const int64_t value) :
+    name_(name), type_(STAT_INTEGER),
+    max_sample_count_(default_max_sample_count_),
+    max_sample_age_(default_max_sample_age_) {
+    setValue(value);
+}
+
+Observation::Observation(const std::string& name, const int128_t& value) :
+    name_(name), type_(STAT_BIG_INTEGER),
+    max_sample_count_(default_max_sample_count_),
+    max_sample_age_(default_max_sample_age_) {
+    setValue(value);
+}
+
+Observation::Observation(const std::string& name, const double value) :
+    name_(name), type_(STAT_FLOAT),
+    max_sample_count_(default_max_sample_count_),
+    max_sample_age_(default_max_sample_age_) {
+    setValue(value);
+}
+
+Observation::Observation(const std::string& name, const StatsDuration& value) :
+    name_(name), type_(STAT_DURATION),
+    max_sample_count_(default_max_sample_count_),
+    max_sample_age_(default_max_sample_age_) {
+    setValue(value);
+}
+
+Observation::Observation(const std::string& name, const std::string& value) :
+    name_(name), type_(STAT_STRING),
+    max_sample_count_(default_max_sample_count_),
+    max_sample_age_(default_max_sample_age_) {
+    setValue(value);
+}
+
+void Observation::setMaxSampleAge(const StatsDuration& duration) {
+    switch(type_) {
+    case STAT_INTEGER: {
+        setMaxSampleAgeInternal(integer_samples_, duration, STAT_INTEGER);
+        return;
+    }
+    case STAT_BIG_INTEGER: {
+        setMaxSampleAgeInternal(big_integer_samples_, duration, STAT_BIG_INTEGER);
+        return;
+    }
+    case STAT_FLOAT: {
+        setMaxSampleAgeInternal(float_samples_, duration, STAT_FLOAT);
+        return;
+    }
+    case STAT_DURATION: {
+        setMaxSampleAgeInternal(duration_samples_, duration, STAT_DURATION);
+        return;
+    }
+    case STAT_STRING: {
+        setMaxSampleAgeInternal(string_samples_, duration, STAT_STRING);
+        return;
+    }
+    default:
+        isc_throw(InvalidStatType, "Unknown statistic type: "
+                  << typeToText(type_));
+    };
+}
+
+void Observation::setMaxSampleCount(uint32_t max_samples) {
+    switch(type_) {
+    case STAT_INTEGER: {
+        setMaxSampleCountInternal(integer_samples_, max_samples, STAT_INTEGER);
+        return;
+    }
+    case STAT_BIG_INTEGER: {
+        setMaxSampleCountInternal(big_integer_samples_, max_samples, STAT_BIG_INTEGER);
+        return;
+    }
+    case STAT_FLOAT: {
+        setMaxSampleCountInternal(float_samples_, max_samples, STAT_FLOAT);
+        return;
+    }
+    case STAT_DURATION: {
+        setMaxSampleCountInternal(duration_samples_, max_samples, STAT_DURATION);
+        return;
+    }
+    case STAT_STRING: {
+        setMaxSampleCountInternal(string_samples_, max_samples, STAT_STRING);
+        return;
+    }
+    default:
+        isc_throw(InvalidStatType, "Unknown statistic type: "
+                  << typeToText(type_));
+    };
+}
+
+void Observation::addValue(const int64_t value) {
+    IntegerSample current = getInteger();
+    setValue(current.first + value);
+}
+
+void Observation::addValue(const int128_t& value) {
+    BigIntegerSample current = getBigInteger();
+    setValue(current.first + value);
+}
+
+void Observation::addValue(const double value) {
+    FloatSample current = getFloat();
+    setValue(current.first + value);
+}
+
+void Observation::addValue(const StatsDuration& value) {
+    DurationSample current = getDuration();
+    setValue(current.first + value);
+}
+
+void Observation::addValue(const std::string& value) {
+    StringSample current = getString();
+    setValue(current.first + value);
+}
+
+void Observation::setValue(const int64_t value) {
+    setValueInternal(value, integer_samples_, STAT_INTEGER);
+}
+
+void Observation::setValue(const int128_t& value) {
+    setValueInternal(value, big_integer_samples_, STAT_BIG_INTEGER);
+}
+
+void Observation::setValue(const double value) {
+    setValueInternal(value, float_samples_, STAT_FLOAT);
+}
+
+void Observation::setValue(const StatsDuration& value) {
+    setValueInternal(value, duration_samples_, STAT_DURATION);
+}
+
+void Observation::setValue(const std::string& value) {
+    setValueInternal(value, string_samples_, STAT_STRING);
+}
+
+size_t Observation::getSize() const {
+    size_t size = 0;
+    switch(type_) {
+    case STAT_INTEGER: {
+        size = getSizeInternal(integer_samples_, STAT_INTEGER);
+        return (size);
+    }
+    case STAT_BIG_INTEGER: {
+        size = getSizeInternal(big_integer_samples_, STAT_BIG_INTEGER);
+        return (size);
+    }
+    case STAT_FLOAT: {
+        size = getSizeInternal(float_samples_, STAT_FLOAT);
+        return (size);
+    }
+    case STAT_DURATION: {
+        size = getSizeInternal(duration_samples_, STAT_DURATION);
+        return (size);
+    }
+    case STAT_STRING: {
+        size = getSizeInternal(string_samples_, STAT_STRING);
+        return (size);
+    }
+    default:
+        isc_throw(InvalidStatType, "Unknown statistic type: "
+                  << typeToText(type_));
+    };
+    return (size);
+}
+
+std::pair<bool, StatsDuration> Observation::getMaxSampleAge() const {
+    return (max_sample_age_);
+}
+
+std::pair<bool, uint32_t> Observation::getMaxSampleCount() const {
+    return (max_sample_count_);
+}
+
+template<typename StorageType>
+size_t Observation::getSizeInternal(StorageType& storage, Type exp_type) const {
+    if (type_ != exp_type) {
+        isc_throw(InvalidStatType, "Invalid statistic type requested: "
+                  << typeToText(exp_type) << ", but the actual type is "
+                  << typeToText(type_));
+    } else {
+        return (storage.size());
+    }
+    return (0); // to avoid compilation error
+}
+
+template<typename SampleType, typename StorageType>
+void Observation::setValueInternal(SampleType value, StorageType& storage,
+                                   Type exp_type) {
+    if (type_ != exp_type) {
+        isc_throw(InvalidStatType, "Invalid statistic type requested: "
+                  << typeToText(exp_type) << ", but the actual type is "
+                  << typeToText(type_));
+    }
+
+    if (storage.empty()) {
+        storage.push_back(make_pair(value, SampleClock::now()));
+    } else {
+        // Storing of more than one sample
+        storage.push_front(make_pair(value, SampleClock::now()));
+
+        if (max_sample_count_.first) {
+            // if max_sample_count_ is set to true
+            // and size of storage is equal to max_sample_count_
+            if (storage.size() > max_sample_count_.second) {
+                storage.pop_back(); // removing the last element
+            }
+        } else {
+            StatsDuration range_of_storage =
+                storage.front().second - storage.back().second;
+            // removing samples until the range_of_storage
+            // stops exceeding the duration limit
+            while (range_of_storage > max_sample_age_.second) {
+                storage.pop_back();
+                range_of_storage =
+                    storage.front().second - storage.back().second;
+            }
+        }
+    }
+}
+
+IntegerSample Observation::getInteger() const {
+    return (getValueInternal<IntegerSample>(integer_samples_, STAT_INTEGER));
+}
+
+BigIntegerSample Observation::getBigInteger() const {
+    return (getValueInternal<BigIntegerSample>(big_integer_samples_, STAT_BIG_INTEGER));
+}
+
+FloatSample Observation::getFloat() const {
+    return (getValueInternal<FloatSample>(float_samples_, STAT_FLOAT));
+}
+
+DurationSample Observation::getDuration() const {
+    return (getValueInternal<DurationSample>(duration_samples_, STAT_DURATION));
+}
+
+StringSample Observation::getString() const {
+    return (getValueInternal<StringSample>(string_samples_, STAT_STRING));
+}
+
+template<typename SampleType, typename Storage>
+SampleType Observation::getValueInternal(Storage& storage, Type exp_type) const {
+    if (type_ != exp_type) {
+        isc_throw(InvalidStatType, "Invalid statistic type requested: "
+                  << typeToText(exp_type) << ", but the actual type is "
+                  << typeToText(type_));
+    }
+
+    if (storage.empty()) {
+        // That should never happen. The first element is always initialized in
+        // the constructor. reset() sets its value to zero, but the element should
+        // still be there.
+        isc_throw(Unexpected, "Observation storage container empty");
+    }
+    return (*storage.begin());
+}
+
+std::list<IntegerSample> Observation::getIntegers() const {
+    return (getValuesInternal<IntegerSample>(integer_samples_, STAT_INTEGER));
+}
+
+std::list<BigIntegerSample> Observation::getBigIntegers() const {
+    return (getValuesInternal<BigIntegerSample>(big_integer_samples_, STAT_BIG_INTEGER));
+}
+
+std::list<FloatSample> Observation::getFloats() const {
+    return (getValuesInternal<FloatSample>(float_samples_, STAT_FLOAT));
+}
+
+std::list<DurationSample> Observation::getDurations() const {
+    return (getValuesInternal<DurationSample>(duration_samples_, STAT_DURATION));
+}
+
+std::list<StringSample> Observation::getStrings() const {
+    return (getValuesInternal<StringSample>(string_samples_, STAT_STRING));
+}
+
+template<typename SampleType, typename Storage>
+std::list<SampleType> Observation::getValuesInternal(Storage& storage,
+                                                     Type exp_type) const {
+    if (type_ != exp_type) {
+        isc_throw(InvalidStatType, "Invalid statistic type requested: "
+                  << typeToText(exp_type) << ", but the actual type is "
+                  << typeToText(type_));
+    }
+
+    if (storage.empty()) {
+        // That should never happen. The first element is always initialized in
+        // the constructor. reset() sets its value to zero, but the element should
+        // still be there.
+        isc_throw(Unexpected, "Observation storage container empty");
+    }
+    return (storage);
+}
+
+template<typename StorageType>
+void Observation::setMaxSampleAgeInternal(StorageType& storage,
+                                          const StatsDuration& duration,
+                                          Type exp_type) {
+    if (type_ != exp_type) {
+        isc_throw(InvalidStatType, "Invalid statistic type requested: "
+                  << typeToText(exp_type) << ", but the actual type is "
+                  << typeToText(type_));
+    }
+    // setting new value of max_sample_age_
+    max_sample_age_.first = true;
+    max_sample_age_.second = duration;
+    // deactivating the max_sample_count_ limit
+    max_sample_count_.first = false;
+
+    StatsDuration range_of_storage =
+        storage.front().second - storage.back().second;
+
+    while (range_of_storage > duration) {
+        // deleting elements which are exceeding the duration limit
+        storage.pop_back();
+        range_of_storage = storage.front().second - storage.back().second;
+    }
+}
+
+template<typename StorageType>
+void Observation::setMaxSampleCountInternal(StorageType& storage,
+                                            uint32_t max_samples,
+                                            Type exp_type) {
+    if (type_ != exp_type) {
+        isc_throw(InvalidStatType, "Invalid statistic type requested: "
+                  << typeToText(exp_type) << ", but the actual type is "
+                  << typeToText(type_));
+    }
+    // Should we refuse the max_samples = 0 value here?
+    // setting new value of max_sample_count_
+    max_sample_count_.first = true;
+    max_sample_count_.second = max_samples;
+    // deactivating the max_sample_age_ limit
+    max_sample_age_.first = false;
+
+    while (storage.size() > max_samples) {
+        // deleting elements which are exceeding the max_samples limit
+        storage.pop_back();
+    }
+}
+
+void Observation::setMaxSampleAgeDefault(const StatsDuration& duration) {
+    // setting new value of default_max_sample_age_
+    default_max_sample_age_.second = duration;
+}
+
+void Observation::setMaxSampleCountDefault(uint32_t max_samples) {
+    if (max_samples == 0) {
+        // deactivating the default_max_sample_count_ limit
+        default_max_sample_count_.first = false;
+        default_max_sample_age_.first = true;
+    } else {
+        // setting new value of default_max_sample_count_
+        default_max_sample_count_.second = max_samples;
+        // deactivating the default_max_sample_age_ limit
+        default_max_sample_age_.first = false;
+        default_max_sample_count_.first = true;
+    }
+}
+
+const StatsDuration& Observation::getMaxSampleAgeDefault() {
+    return (default_max_sample_age_.second);
+}
+
+uint32_t Observation::getMaxSampleCountDefault() {
+    if (default_max_sample_count_.first) {
+        return (default_max_sample_count_.second);
+    } else {
+        return (0);
+    }
+}
+
+std::string Observation::typeToText(Type type) {
+    std::stringstream tmp;
+    switch (type) {
+    case STAT_INTEGER:
+        tmp << "integer";
+        break;
+    case STAT_BIG_INTEGER:
+        tmp << "big integer";
+        break;
+    case STAT_FLOAT:
+        tmp << "float";
+        break;
+    case STAT_DURATION:
+        tmp << "duration";
+        break;
+    case STAT_STRING:
+        tmp << "string";
+        break;
+    default:
+        tmp << "unknown";
+        break;
+    }
+    tmp << "(" << type << ")";
+    return (tmp.str());
+}
+
+isc::data::ConstElementPtr
+Observation::getJSON() const {
+    ElementPtr list = isc::data::Element::createList(); // multiple observations
+    ElementPtr entry;
+    ElementPtr value;
+    ElementPtr timestamp;
+
+    // Support for retrieving more than one sample
+    // retrieving all samples of indicated observation
+    switch (type_) {
+    case STAT_INTEGER: {
+        std::list<IntegerSample> s = getIntegers(); // List of all integer samples
+
+        // Iteration over all elements in the list
+        // and adding alternately value and timestamp to the entry
+        for (std::list<IntegerSample>::iterator it = s.begin(); it != s.end(); ++it) {
+            entry = isc::data::Element::createList();
+            value = isc::data::Element::create(static_cast<int64_t>((*it).first));
+            timestamp = isc::data::Element::create(isc::util::clockToText((*it).second));
+
+            entry->add(value);
+            entry->add(timestamp);
+
+            list->add(entry);
+        }
+        break;
+    }
+    case STAT_BIG_INTEGER: {
+        std::list<BigIntegerSample> const& samples(getBigIntegers());
+
+        // Iterate over all elements in the list and alternately add
+        // value and timestamp to the entry.
+        for (BigIntegerSample const& i : samples) {
+            entry = isc::data::Element::createList();
+            value = isc::data::Element::create(i.first);
+            timestamp = isc::data::Element::create(isc::util::clockToText(i.second));
+
+            entry->add(value);
+            entry->add(timestamp);
+
+            list->add(entry);
+        }
+        break;
+    }
+    case STAT_FLOAT: {
+        std::list<FloatSample> s = getFloats();
+
+        // Iteration over all elements in the list
+        // and adding alternately value and timestamp to the entry
+        for (std::list<FloatSample>::iterator it = s.begin(); it != s.end(); ++it) {
+            entry = isc::data::Element::createList();
+            value = isc::data::Element::create((*it).first);
+            timestamp = isc::data::Element::create(isc::util::clockToText((*it).second));
+
+            entry->add(value);
+            entry->add(timestamp);
+
+            list->add(entry);
+        }
+        break;
+    }
+    case STAT_DURATION: {
+        std::list<DurationSample> s = getDurations();
+
+        // Iteration over all elements in the list
+        // and adding alternately value and timestamp to the entry
+        for (std::list<DurationSample>::iterator it = s.begin(); it != s.end(); ++it) {
+            entry = isc::data::Element::createList();
+            value = isc::data::Element::create(isc::util::durationToText((*it).first));
+            timestamp = isc::data::Element::create(isc::util::clockToText((*it).second));
+
+            entry->add(value);
+            entry->add(timestamp);
+
+            list->add(entry);
+        }
+        break;
+    }
+    case STAT_STRING: {
+        std::list<StringSample> s = getStrings();
+
+        // Iteration over all elements in the list
+        // and adding alternately value and timestamp to the entry
+        for (std::list<StringSample>::iterator it = s.begin(); it != s.end(); ++it) {
+            entry = isc::data::Element::createList();
+            value = isc::data::Element::create((*it).first);
+            timestamp = isc::data::Element::create(isc::util::clockToText((*it).second));
+
+            entry->add(value);
+            entry->add(timestamp);
+
+            list->add(entry);
+        }
+        break;
+    }
+    default:
+        isc_throw(InvalidStatType, "Unknown statistic type: "
+                  << typeToText(type_));
+    };
+
+    return (list);
+}
+
+void Observation::reset() {
+    switch(type_) {
+    case STAT_INTEGER: {
+        integer_samples_.clear();
+        setValue(static_cast<int64_t>(0));
+        return;
+    }
+    case STAT_BIG_INTEGER: {
+        big_integer_samples_.clear();
+        setValue(int128_t(0));
+        return;
+    }
+    case STAT_FLOAT: {
+        float_samples_.clear();
+        setValue(0.0);
+        return;
+    }
+    case STAT_DURATION: {
+        duration_samples_.clear();
+        setValue(StatsDuration::zero());
+        return;
+    }
+    case STAT_STRING: {
+        string_samples_.clear();
+        setValue(string(""));
+        return;
+    }
+    default:
+        isc_throw(InvalidStatType, "Unknown statistic type: "
+                  << typeToText(type_));
+    };
+}
+
+} // end of namespace stats
+} // end of namespace isc
diff --git a/src/lib/stats/observation.h b/src/lib/stats/observation.h
new file mode 100644
index 0000000..df9a94c
--- /dev/null
+++ b/src/lib/stats/observation.h
@@ -0,0 +1,484 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef OBSERVATION_H
+#define OBSERVATION_H
+
+#include <cc/data.h>
+#include <exceptions/exceptions.h>
+#include <util/bigints.h>
+
+#include <boost/shared_ptr.hpp>
+
+#include <chrono>
+#include <list>
+
+#include <stdint.h>
+
+namespace isc {
+namespace stats {
+
+/// @brief Exception thrown if invalid statistic type is used
+///
+/// For example statistic is of type duration, but methods using
+/// it as integer are called.
+class InvalidStatType : public Exception {
+public:
+    InvalidStatType(const char* file, size_t line, const char* what) :
+        isc::Exception(file, line, what) {}
+};
+
+/// @brief Define clock type.
+///
+/// @note: we use the system clock i.e. the wall clock because this
+/// clock can be converted from and to standard Unix time (time_t).
+typedef std::chrono::system_clock SampleClock;
+
+/// @brief Defines duration type.
+///
+/// @note: the precision depends on the system,
+typedef std::chrono::system_clock::duration StatsDuration;
+
+/// @brief Returns the number of seconds in a duration.
+///
+/// @param dur The duration.
+/// @return The number of seconds in the given duration.
+inline long toSeconds(const StatsDuration& dur) {
+    return ((std::chrono::duration_cast<std::chrono::seconds>(dur)).count());
+}
+
+/// @defgroup stat_samples Specifies supported observation types.
+///
+/// @brief The list covers all supported types of observations.
+///
+/// @{
+
+/// @brief Integer (implemented as signed 64-bit integer)
+typedef std::pair<int64_t, SampleClock::time_point> IntegerSample;
+
+/// @brief BigInteger (implemented as signed 128-bit integer)
+typedef std::pair<isc::util::int128_t, SampleClock::time_point> BigIntegerSample;
+
+/// @brief Float (implemented as double precision)
+typedef std::pair<double, SampleClock::time_point> FloatSample;
+
+/// @brief Time Duration
+typedef std::pair<StatsDuration, SampleClock::time_point> DurationSample;
+
+/// @brief String
+typedef std::pair<std::string, SampleClock::time_point> StringSample;
+
+/// @}
+
+/// @brief Represents a single observable characteristic (a 'statistic')
+///
+/// Currently it supports one of four types: integer (implemented as signed 64
+/// bit integer), float (implemented as double), time duration (implemented with
+/// millisecond precision) and string. Absolute (setValue) and
+/// incremental (addValue) modes are supported. Statistic type is determined
+/// during its first use. Once type is set, any additional observations recorded
+/// must be of the same type. Attempting to set or extract information about
+/// other types will result in InvalidStateType exception.
+///
+/// Observation can be retrieved in one of @ref getInteger, @ref getFloat,
+/// @ref getDuration, @ref getString (appropriate type must be used) or
+/// @ref getJSON, which is generic and can be used for all types.
+///
+/// Since Kea 1.6 multiple samples are stored for the same observation.
+class Observation {
+public:
+
+    /// @brief Type of available statistics
+    ///
+    /// Note that those will later be exposed using control socket. Therefore
+    /// an easy to understand names were chosen (integer instead of uint64).
+    /// To avoid confusion, we will support only one type of integer and only
+    /// one type of floating points. Initially, these are represented by
+    /// int64_t and double. If convincing use cases appear to change them
+    /// to something else, we may change the underlying type.
+    enum Type {
+        STAT_INTEGER,       ///< this statistic is signed 64-bit integer value
+        STAT_BIG_INTEGER,   ///< this statistic is signed 128-bit integer value
+        STAT_FLOAT,         ///< this statistic is a floating point value
+        STAT_DURATION,      ///< this statistic represents time duration
+        STAT_STRING         ///< this statistic represents a string
+    };
+
+    /// @brief Constructor for integer observations
+    ///
+    /// @param name observation name
+    /// @param value integer value observed.
+    Observation(const std::string& name, const int64_t value);
+
+    /// @brief Constructor for big integer observations
+    ///
+    /// @param name observation name
+    /// @param value integer value observed.
+    Observation(const std::string& name, const isc::util::int128_t& value);
+
+    /// @brief Constructor for floating point observations
+    ///
+    /// @param name observation name
+    /// @param value floating point value observed.
+    Observation(const std::string& name, const double value);
+
+    /// @brief Constructor for duration observations
+    ///
+    /// @param name observation name
+    /// @param value duration observed.
+    Observation(const std::string& name, const StatsDuration& value);
+
+    /// @brief Constructor for string observations
+    ///
+    /// @param name observation name
+    /// @param value string observed.
+    Observation(const std::string& name, const std::string& value);
+
+    /// @brief Determines maximum age of samples.
+    ///
+    /// Specifies that statistic name should be stored not as a single value,
+    /// but rather as a set of values. The duration determines the timespan.
+    /// Samples older than duration will be discarded. This is time-constrained
+    /// approach. For sample count constrained approach, see @ref
+    /// setMaxSampleCount() below.
+    ///
+    ///
+    /// @param duration determines maximum age of samples
+    /// Example:
+    /// To set a statistic to keep observations for the last 5 minutes, call:
+    /// setMaxSampleAge(std::chrono::minutes(5));
+    /// To revert statistic to a single value, call:
+    /// setMaxSampleAge(StatsDuration::zero());
+    void setMaxSampleAge(const StatsDuration& duration);
+
+    /// @brief Determines how many samples of a given statistic should be kept.
+    ///
+    /// Specifies that statistic name should be stored not as a single value,
+    /// but rather as a set of values. In this form, at most max_samples will
+    /// be kept. When adding max_samples + 1 sample, the oldest sample will be
+    /// discarded.
+    ///
+    ///
+    /// @param max_samples how many samples of a given statistic should be kept
+    /// Example:
+    /// To set a statistic to keep the last 100 observations, call:
+    /// setMaxSampleCount(100);
+    void setMaxSampleCount(uint32_t max_samples);
+
+    /// @brief Determines default maximum age of samples.
+    ///
+    /// @param duration default maximum age of samples to keep.
+    static void setMaxSampleAgeDefault(const StatsDuration& duration);
+
+    /// @brief Determines default maximum count of samples.
+    ///
+    /// @param max_samples default maximum count of samples to keep.
+    /// (0 means to disable count limit and enable age limit)
+    static void setMaxSampleCountDefault(uint32_t max_samples);
+
+    /// @brief Get default maximum age of samples.
+    ///
+    /// @return default maximum age of samples to keep.
+    static const StatsDuration& getMaxSampleAgeDefault();
+
+    /// @brief Get default maximum count of samples.
+    ///
+    /// @return max_samples default maximum count of samples to keep.
+    /// (0 means that count limit was disabled)
+    static uint32_t getMaxSampleCountDefault();
+
+    /// @
+
+    /// @brief Records absolute integer observation
+    ///
+    /// @param value integer value observed
+    /// @throw InvalidStatType if statistic is not integer
+    void setValue(const int64_t value);
+
+    /// @brief Records big integer observation
+    ///
+    /// @param value integer value observed
+    /// @throw InvalidStatType if statistic is not integer
+    void setValue(const isc::util::int128_t& value);
+
+    /// @brief Records absolute floating point observation
+    ///
+    /// @param value floating point value observed
+    /// @throw InvalidStatType if statistic is not fp
+    void setValue(const double value);
+
+    /// @brief Records absolute duration observation
+    ///
+    /// @param value duration value observed
+    /// @throw InvalidStatType if statistic is not time duration
+    void setValue(const StatsDuration& value);
+
+    /// @brief Records absolute string observation
+    ///
+    /// @param value string value observed
+    /// @throw InvalidStatType if statistic is not a string
+    void setValue(const std::string& value);
+
+    /// @brief Records incremental integer observation
+    ///
+    /// @param value integer value observed
+    /// @throw InvalidStatType if statistic is not integer
+    void addValue(const int64_t value);
+
+    /// @brief Records incremental integer observation
+    ///
+    /// @param value integer value observed
+    /// @throw InvalidStatType if statistic is not integer
+    void addValue(const isc::util::int128_t& value);
+
+    /// @brief Records incremental floating point observation
+    ///
+    /// @param value floating point value observed
+    /// @throw InvalidStatType if statistic is not fp
+    void addValue(const double value);
+
+    /// @brief Records incremental duration observation
+    ///
+    /// @param value duration value observed
+    /// @throw InvalidStatType if statistic is not time duration
+    void addValue(const StatsDuration& value);
+
+    /// @brief Records incremental string observation.
+    ///
+    /// @param value string value observed
+    /// @throw InvalidStatType if statistic is not a string
+    void addValue(const std::string& value);
+
+    /// @brief Returns size of observed storage
+    ///
+    /// @return size of storage
+    size_t getSize() const;
+
+    /// @brief Returns both values of max_sample_age_ of statistic.
+    ///
+    /// @return max_sample_age_.
+    std::pair<bool, StatsDuration> getMaxSampleAge() const;
+
+    /// @brief Returns both values of max_sample_count_ of statistic.
+    ///
+    /// @return max_sample_count_.
+    std::pair<bool, uint32_t> getMaxSampleCount() const;
+
+    /// @brief Resets statistic.
+    ///
+    /// Sets statistic to a neutral (0, 0.0 or "") value and
+    /// clears the underlying storage.
+    void reset();
+
+    /// @brief Returns statistic type
+    /// @return statistic type
+    Type getType() const {
+        return (type_);
+    }
+
+    /// @brief Returns observed integer sample
+    /// @return observed sample (value + timestamp)
+    /// @throw InvalidStatType if statistic is not integer
+    IntegerSample getInteger() const;
+
+    /// @brief Returns observed integer sample
+    /// @return observed sample (value + timestamp)
+    /// @throw InvalidStatType if statistic is not integer
+    BigIntegerSample getBigInteger() const;
+
+    /// @brief Returns observed float sample
+    /// @return observed sample (value + timestamp)
+    /// @throw InvalidStatType if statistic is not fp
+    FloatSample getFloat() const;
+
+    /// @brief Returns observed duration sample
+    /// @return observed sample (value + timestamp)
+    /// @throw InvalidStatType if statistic is not time duration
+    DurationSample getDuration() const;
+
+    /// @brief Returns observed string sample
+    /// @return observed sample (value + timestamp)
+    /// @throw InvalidStatType if statistic is not a string
+    StringSample getString() const;
+
+    /// @brief Returns observed integer samples
+    /// @return list of observed samples (value + timestamp)
+    /// @throw InvalidStatType if statistic is not integer
+    std::list<IntegerSample> getIntegers() const;
+
+    /// @brief Returns observed big-integer samples
+    /// @return list of observed samples (value + timestamp)
+    /// @throw InvalidStatType if statistic is not integer
+    std::list<BigIntegerSample> getBigIntegers() const;
+
+    /// @brief Returns observed float samples
+    /// @return list of observed samples (value + timestamp)
+    /// @throw InvalidStatType if statistic is not fp
+    std::list<FloatSample> getFloats() const;
+
+    /// @brief Returns observed duration samples
+    /// @return list of observed samples (value + timestamp)
+    /// @throw InvalidStatType if statistic is not time duration
+    std::list<DurationSample> getDurations() const;
+
+    /// @brief Returns observed string samples
+    /// @return list of observed samples (value + timestamp)
+    /// @throw InvalidStatType if statistic is not a string
+    std::list<StringSample> getStrings() const;
+
+    /// @brief Returns as a JSON structure
+    /// @return JSON structures representing all observations
+    isc::data::ConstElementPtr getJSON() const;
+
+    /// @brief Converts statistic type to string
+    /// @return textual name of statistic type
+    static std::string typeToText(Type type);
+
+    /// @brief Returns observation name
+    std::string getName() const {
+        return (name_);
+    }
+
+private:
+
+    /// @brief Returns size of observed storage
+    ///
+    /// This method returns size of observed storage.
+    /// It is used by public methods to return size of
+    /// available storages.
+    /// @tparam Storage type of storage (e.g. list<IntegerSample>)
+    /// @param storage storage which size will be returned
+    /// @param exp_type expected observation type (used for sanity checking)
+    /// @return size of storage
+    template<typename StorageType>
+    size_t getSizeInternal(StorageType& storage, Type exp_type) const;
+
+    /// @brief Records absolute sample (internal version)
+    ///
+    /// This method records an absolute value of an observation.
+    /// It is used by public methods to add sample to one of
+    /// available storages.
+    ///
+    /// @tparam SampleType type of sample (e.g. IntegerSample)
+    /// @tparam StorageType type of storage (e.g. list<IntegerSample>)
+    /// @param value observation to be recorded
+    /// @param storage observation will be stored here
+    /// @param exp_type expected observation type (used for sanity checking)
+    /// @throw InvalidStatType if observation type mismatches
+    template<typename SampleType, typename StorageType>
+    void setValueInternal(SampleType value, StorageType& storage,
+                          Type exp_type);
+
+    /// @brief Returns a sample (internal version)
+    ///
+    /// @tparam SampleType type of sample (e.g. IntegerSample)
+    /// @tparam StorageType type of storage (e.g. list<IntegerSample>)
+    /// @param observation storage
+    /// @param exp_type expected observation type (used for sanity checking)
+    /// @throw InvalidStatType if observation type mismatches
+    /// @return Observed sample
+    template<typename SampleType, typename Storage>
+    SampleType getValueInternal(Storage& storage, Type exp_type) const;
+
+    /// @brief Returns samples (internal version)
+    ///
+    /// @tparam SampleType type of samples (e.g. IntegerSample)
+    /// @tparam Storage type of storage (e.g. list<IntegerSample>)
+    /// @param observation storage
+    /// @param exp_type expected observation type (used for sanity checking)
+    /// @throw InvalidStatType if observation type mismatches
+    /// @return list of observed samples
+    template<typename SampleType, typename Storage>
+    std::list<SampleType> getValuesInternal(Storage& storage,
+                                            Type exp_type) const;
+
+    /// @brief Determines maximum age of samples.
+    ///
+    /// @tparam Storage type of storage (e.g. list<IntegerSample>)
+    /// @param storage storage on which limit will be set
+    /// @param duration determines maximum age of samples
+    /// @param exp_type expected observation type (used for sanity checking)
+    template<typename StorageType>
+    void setMaxSampleAgeInternal(StorageType& storage,
+                                 const StatsDuration& duration, Type exp_type);
+
+    /// @brief Determines how many samples of a given statistic should be kept.
+    ///
+    /// @tparam Storage type of storage (e.g. list<IntegerSample>)
+    /// @param storage storage on which limit will be set
+    /// @param max_samples determines maximum number of samples
+    /// @param exp_type expected observation type (used for sanity checking)
+    template<typename StorageType>
+    void setMaxSampleCountInternal(StorageType& storage,
+                                   uint32_t max_samples, Type exp_type);
+
+    /// @brief Observation (statistic) name
+    std::string name_;
+
+    /// @brief Observation (statistic) type)
+    Type type_;
+
+    /// @brief Maximum number of samples
+    /// The limit is represented as a pair
+    /// of bool value and uint32_t
+    /// Only one kind of limit can be active
+    /// The bool value informs which limit
+    /// is available
+    /// True means active limit, false means inactive limit
+    std::pair<bool, uint32_t> max_sample_count_;
+
+    /// @brief Default maximum number of samples
+    ///
+    /// By default the MaxSampleCount is set to 20
+    /// and MaxSampleAge is disabled
+    static std::pair<bool, uint32_t> default_max_sample_count_;
+
+    /// @brief Maximum timespan of samples
+    /// The limit is represented as a pair
+    /// of bool value and StatsDuration
+    /// Only one kind of limit can be active
+    /// The bool value informs which limit
+    /// is available
+    /// True means active limit, false means inactive limit
+    std::pair<bool, StatsDuration> max_sample_age_;
+
+    /// @brief Default maximum timespan of samples
+    ///
+    /// By default the MaxSampleCount is set to 20
+    /// and MaxSampleAge is disabled
+    static std::pair<bool, StatsDuration> default_max_sample_age_;
+
+    /// @defgroup samples_storage Storage for supported observations
+    ///
+    /// @brief The following containers serve as a storage for all supported
+    /// observation types.
+    ///
+    /// @{
+
+    /// @brief Storage for integer samples
+    std::list<IntegerSample> integer_samples_;
+
+    /// @brief Storage for big integer samples
+    std::list<BigIntegerSample> big_integer_samples_;
+
+    /// @brief Storage for floating point samples
+    std::list<FloatSample> float_samples_;
+
+    /// @brief Storage for time duration samples
+    std::list<DurationSample> duration_samples_;
+
+    /// @brief Storage for string samples
+    std::list<StringSample> string_samples_;
+    /// @}
+};
+
+/// @brief Observation pointer
+typedef boost::shared_ptr<Observation> ObservationPtr;
+
+}
+}
+
+#endif // OBSERVATION_H
diff --git a/src/lib/stats/stats.dox b/src/lib/stats/stats.dox
new file mode 100644
index 0000000..7d4d3b5
--- /dev/null
+++ b/src/lib/stats/stats.dox
@@ -0,0 +1,16 @@
+// Copyright (C) 2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+/**
+ @page libstats libkea-stats - Kea Statistics Library
+
+@section statsMTConsiderations Multi-Threading Consideration for Statistics
+
+The statistic manager (@c isc::stats::StatsMgr singleton) is Kea thread safe
+i.e. it is thread safe when the multi-threading mode is true (when the
+multi-threading mode is false Kea main thread processes packets).
+
+*/
diff --git a/src/lib/stats/stats_mgr.cc b/src/lib/stats/stats_mgr.cc
new file mode 100644
index 0000000..b420cab
--- /dev/null
+++ b/src/lib/stats/stats_mgr.cc
@@ -0,0 +1,541 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include <stats/stats_mgr.h>
+#include <cc/data.h>
+#include <cc/command_interpreter.h>
+#include <util/multi_threading_mgr.h>
+#include <util/bigints.h>
+
+#include <boost/make_shared.hpp>
+
+#include <chrono>
+
+using namespace std;
+using namespace std::chrono;
+using namespace isc::data;
+using namespace isc::config;
+using namespace isc::util;
+
+namespace isc {
+namespace stats {
+
+StatsMgr&
+StatsMgr::instance() {
+    static StatsMgr stats_mgr;
+    return (stats_mgr);
+}
+
+StatsMgr::StatsMgr() :
+    global_(boost::make_shared<StatContext>()), mutex_(new mutex) {
+}
+
+void
+StatsMgr::setValue(const string& name, const int64_t value) {
+    MultiThreadingLock lock(*mutex_);
+    setValueInternal(name, value);
+}
+
+void
+StatsMgr::setValue(const string& name, const int128_t& value) {
+    MultiThreadingLock lock(*mutex_);
+    setValueInternal(name, value);
+}
+
+void
+StatsMgr::setValue(const string& name, const double value) {
+    MultiThreadingLock lock(*mutex_);
+    setValueInternal(name, value);
+}
+
+void
+StatsMgr::setValue(const string& name, const StatsDuration& value) {
+    MultiThreadingLock lock(*mutex_);
+    setValueInternal(name, value);
+}
+
+void
+StatsMgr::setValue(const string& name, const string& value) {
+    MultiThreadingLock lock(*mutex_);
+    setValueInternal(name, value);
+}
+
+void
+StatsMgr::addValue(const string& name, const int64_t value) {
+    MultiThreadingLock lock(*mutex_);
+    addValueInternal(name, value);
+}
+
+void
+StatsMgr::addValue(const string& name, const int128_t& value) {
+    MultiThreadingLock lock(*mutex_);
+    addValueInternal(name, value);
+}
+
+void
+StatsMgr::addValue(const string& name, const double value) {
+    MultiThreadingLock lock(*mutex_);
+    addValueInternal(name, value);
+}
+
+void
+StatsMgr::addValue(const string& name, const StatsDuration& value) {
+    MultiThreadingLock lock(*mutex_);
+    addValueInternal(name, value);
+}
+
+void
+StatsMgr::addValue(const string& name, const string& value) {
+    MultiThreadingLock lock(*mutex_);
+    addValueInternal(name, value);
+}
+
+ObservationPtr
+StatsMgr::getObservation(const string& name) const {
+    MultiThreadingLock lock(*mutex_);
+    return (getObservationInternal(name));
+}
+
+ObservationPtr
+StatsMgr::getObservationInternal(const string& name) const {
+    /// @todo: Implement contexts.
+    // Currently we keep everything in a global context.
+    return (global_->get(name));
+}
+
+void
+StatsMgr::addObservation(const ObservationPtr& stat) {
+    MultiThreadingLock lock(*mutex_);
+    addObservationInternal(stat);
+}
+
+void
+StatsMgr::addObservationInternal(const ObservationPtr& stat) {
+    /// @todo: Implement contexts.
+    // Currently we keep everything in a global context.
+    global_->add(stat);
+}
+
+bool
+StatsMgr::deleteObservation(const string& name) {
+    MultiThreadingLock lock(*mutex_);
+    return (deleteObservationInternal(name));
+}
+
+bool
+StatsMgr::deleteObservationInternal(const string& name) {
+    /// @todo: Implement contexts.
+    // Currently we keep everything in a global context.
+    return (global_->del(name));
+}
+
+bool
+StatsMgr::setMaxSampleAge(const string& name, const StatsDuration& duration) {
+    MultiThreadingLock lock(*mutex_);
+    return (setMaxSampleAgeInternal(name, duration));
+}
+
+bool
+StatsMgr::setMaxSampleAgeInternal(const string& name,
+                                  const StatsDuration& duration) {
+    ObservationPtr obs = getObservationInternal(name);
+    if (obs) {
+        obs->setMaxSampleAge(duration);
+        return (true);
+    }
+    return (false);
+}
+
+bool
+StatsMgr::setMaxSampleCount(const string& name, uint32_t max_samples) {
+    MultiThreadingLock lock(*mutex_);
+    return (setMaxSampleCountInternal(name, max_samples));
+}
+
+bool
+StatsMgr::setMaxSampleCountInternal(const string& name,
+                                    uint32_t max_samples) {
+    ObservationPtr obs = getObservationInternal(name);
+    if (obs) {
+        obs->setMaxSampleCount(max_samples);
+        return (true);
+    }
+    return (false);
+}
+
+void
+StatsMgr::setMaxSampleAgeAll(const StatsDuration& duration) {
+    MultiThreadingLock lock(*mutex_);
+    setMaxSampleAgeAllInternal(duration);
+}
+
+void
+StatsMgr::setMaxSampleAgeAllInternal(const StatsDuration& duration) {
+    global_->setMaxSampleAgeAll(duration);
+}
+
+void
+StatsMgr::setMaxSampleCountAll(uint32_t max_samples) {
+    MultiThreadingLock lock(*mutex_);
+    setMaxSampleCountAllInternal(max_samples);
+}
+
+void
+StatsMgr::setMaxSampleCountAllInternal(uint32_t max_samples) {
+    global_->setMaxSampleCountAll(max_samples);
+}
+
+void
+StatsMgr::setMaxSampleAgeDefault(const StatsDuration& duration) {
+    MultiThreadingLock lock(*mutex_);
+    setMaxSampleAgeDefaultInternal(duration);
+}
+
+void
+StatsMgr::setMaxSampleAgeDefaultInternal(const StatsDuration& duration) {
+    Observation::setMaxSampleAgeDefault(duration);
+}
+
+void
+StatsMgr::setMaxSampleCountDefault(uint32_t max_samples) {
+    MultiThreadingLock lock(*mutex_);
+    setMaxSampleCountDefaultInternal(max_samples);
+}
+
+void
+StatsMgr::setMaxSampleCountDefaultInternal(uint32_t max_samples) {
+    Observation::setMaxSampleCountDefault(max_samples);
+}
+
+const StatsDuration&
+StatsMgr::getMaxSampleAgeDefault() const {
+    MultiThreadingLock lock(*mutex_);
+    return (getMaxSampleAgeDefaultInternal());
+}
+
+const StatsDuration&
+StatsMgr::getMaxSampleAgeDefaultInternal() const {
+    return (Observation::getMaxSampleAgeDefault());
+}
+
+uint32_t
+StatsMgr::getMaxSampleCountDefault() const {
+    MultiThreadingLock lock(*mutex_);
+    return (getMaxSampleCountDefaultInternal());
+}
+
+uint32_t
+StatsMgr::getMaxSampleCountDefaultInternal() const {
+    return (Observation::getMaxSampleCountDefault());
+}
+
+bool
+StatsMgr::reset(const string& name) {
+    MultiThreadingLock lock(*mutex_);
+    return (resetInternal(name));
+}
+
+bool
+StatsMgr::resetInternal(const string& name) {
+    ObservationPtr obs = getObservationInternal(name);
+    if (obs) {
+        obs->reset();
+        return (true);
+    }
+    return (false);
+}
+
+bool
+StatsMgr::del(const string& name) {
+    MultiThreadingLock lock(*mutex_);
+    return (delInternal(name));
+}
+
+bool
+StatsMgr::delInternal(const string& name) {
+    return (global_->del(name));
+}
+
+void
+StatsMgr::removeAll() {
+    MultiThreadingLock lock(*mutex_);
+    removeAllInternal();
+}
+
+void
+StatsMgr::removeAllInternal() {
+    global_->clear();
+}
+
+ConstElementPtr
+StatsMgr::get(const string& name) const {
+    MultiThreadingLock lock(*mutex_);
+    return (getInternal(name));
+}
+
+ConstElementPtr
+StatsMgr::getInternal(const string& name) const {
+    ElementPtr map = Element::createMap(); // a map
+    ObservationPtr obs = getObservationInternal(name);
+    if (obs) {
+        map->set(name, obs->getJSON()); // that contains observations
+    }
+    return (map);
+}
+
+ConstElementPtr
+StatsMgr::getAll() const {
+    MultiThreadingLock lock(*mutex_);
+    return (getAllInternal());
+}
+
+ConstElementPtr
+StatsMgr::getAllInternal() const {
+    return (global_->getAll());
+}
+
+void
+StatsMgr::resetAll() {
+    MultiThreadingLock lock(*mutex_);
+    resetAllInternal();
+}
+
+void
+StatsMgr::resetAllInternal() {
+    global_->resetAll();
+}
+
+size_t
+StatsMgr::getSize(const string& name) const {
+    MultiThreadingLock lock(*mutex_);
+    return (getSizeInternal(name));
+}
+
+size_t
+StatsMgr::getSizeInternal(const string& name) const {
+    ObservationPtr obs = getObservationInternal(name);
+    if (obs) {
+        return (obs->getSize());
+    }
+    return (0);
+}
+
+size_t
+StatsMgr::count() const {
+    MultiThreadingLock lock(*mutex_);
+    return (countInternal());
+}
+
+size_t
+StatsMgr::countInternal() const {
+    return (global_->size());
+}
+
+ConstElementPtr
+StatsMgr::statisticSetMaxSampleAgeHandler(const string& /*name*/,
+                                          const ConstElementPtr& params) {
+    string name, error;
+    StatsDuration duration;
+    if (!StatsMgr::getStatName(params, name, error)) {
+        return (createAnswer(CONTROL_RESULT_ERROR, error));
+    }
+    if (!StatsMgr::getStatDuration(params, duration, error)) {
+        return (createAnswer(CONTROL_RESULT_ERROR, error));
+    }
+    if (StatsMgr::instance().setMaxSampleAge(name, duration)) {
+        return (createAnswer(CONTROL_RESULT_SUCCESS,
+                            "Statistic '" + name + "' duration limit is set."));
+    } else {
+        return (createAnswer(CONTROL_RESULT_ERROR,
+                             "No '" + name + "' statistic found"));
+    }
+}
+
+ConstElementPtr
+StatsMgr::statisticSetMaxSampleCountHandler(const string& /*name*/,
+                                            const ConstElementPtr& params) {
+    string name, error;
+    uint32_t max_samples;
+    if (!StatsMgr::getStatName(params, name, error)) {
+        return (createAnswer(CONTROL_RESULT_ERROR, error));
+    }
+    if (!StatsMgr::getStatMaxSamples(params, max_samples, error)) {
+        return (createAnswer(CONTROL_RESULT_ERROR, error));
+    }
+    if (StatsMgr::instance().setMaxSampleCount(name, max_samples)) {
+        return (createAnswer(CONTROL_RESULT_SUCCESS,
+                            "Statistic '" + name + "' count limit is set."));
+    } else {
+        return (createAnswer(CONTROL_RESULT_ERROR,
+                           "No '" + name + "' statistic found"));
+    }
+}
+
+ConstElementPtr
+StatsMgr::statisticGetHandler(const string& /*name*/,
+                              const ConstElementPtr& params) {
+    string name, error;
+    if (!StatsMgr::getStatName(params, name, error)) {
+        return (createAnswer(CONTROL_RESULT_ERROR, error));
+    }
+    return (createAnswer(CONTROL_RESULT_SUCCESS,
+                         StatsMgr::instance().get(name)));
+}
+
+ConstElementPtr
+StatsMgr::statisticResetHandler(const string& /*name*/,
+                                const ConstElementPtr& params) {
+    string name, error;
+    if (!StatsMgr::getStatName(params, name, error)) {
+        return (createAnswer(CONTROL_RESULT_ERROR, error));
+    }
+    if (StatsMgr::instance().reset(name)) {
+        return (createAnswer(CONTROL_RESULT_SUCCESS,
+                             "Statistic '" + name + "' reset."));
+    } else {
+        return (createAnswer(CONTROL_RESULT_ERROR,
+                             "No '" + name + "' statistic found"));
+    }
+}
+
+ConstElementPtr
+StatsMgr::statisticRemoveHandler(const string& /*name*/,
+                                 const ConstElementPtr& params) {
+    string name, error;
+    if (!StatsMgr::getStatName(params, name, error)) {
+        return (createAnswer(CONTROL_RESULT_ERROR, error));
+    }
+    if (StatsMgr::instance().del(name)) {
+        return (createAnswer(CONTROL_RESULT_SUCCESS,
+                             "Statistic '" + name + "' removed."));
+    } else {
+        return (createAnswer(CONTROL_RESULT_ERROR,
+                             "No '" + name + "' statistic found"));
+    }
+
+}
+
+ConstElementPtr
+StatsMgr::statisticRemoveAllHandler(const string& /*name*/,
+                                    const ConstElementPtr& /*params*/) {
+    StatsMgr::instance().removeAll();
+    return (createAnswer(CONTROL_RESULT_SUCCESS,
+                         "Warning: statistic-remove-all command is deprecated."
+                         " All statistics removed."));
+}
+
+ConstElementPtr
+StatsMgr::statisticGetAllHandler(const string& /*name*/,
+                                 const ConstElementPtr& /*params*/) {
+    ConstElementPtr all_stats = StatsMgr::instance().getAll();
+    return (createAnswer(CONTROL_RESULT_SUCCESS, all_stats));
+}
+
+ConstElementPtr
+StatsMgr::statisticResetAllHandler(const string& /*name*/,
+                                   const ConstElementPtr& /*params*/) {
+    StatsMgr::instance().resetAll();
+    return (createAnswer(CONTROL_RESULT_SUCCESS,
+                         "All statistics reset to neutral values."));
+}
+
+ConstElementPtr
+StatsMgr::statisticSetMaxSampleAgeAllHandler(const ConstElementPtr& params) {
+    string error;
+    StatsDuration duration;
+    if (!StatsMgr::getStatDuration(params, duration, error)) {
+        return (createAnswer(CONTROL_RESULT_ERROR, error));
+    }
+    MultiThreadingLock lock(*mutex_);
+    StatsMgr::instance().setMaxSampleCountDefaultInternal(0);
+    StatsMgr::instance().setMaxSampleAgeDefaultInternal(duration);
+    StatsMgr::instance().setMaxSampleAgeAllInternal(duration);
+    return (createAnswer(CONTROL_RESULT_SUCCESS,
+                         "All statistics duration limit are set."));
+}
+
+ConstElementPtr
+StatsMgr::statisticSetMaxSampleCountAllHandler(const ConstElementPtr& params) {
+    string error;
+    uint32_t max_samples;
+    if (!StatsMgr::getStatMaxSamples(params, max_samples, error)) {
+        return (createAnswer(CONTROL_RESULT_ERROR, error));
+    }
+    if (max_samples == 0) {
+        error = "'max-samples' parameter must not be zero";
+        return (createAnswer(CONTROL_RESULT_ERROR, error));
+    }
+    MultiThreadingLock lock(*mutex_);
+    StatsMgr::instance().setMaxSampleCountDefaultInternal(max_samples);
+    StatsMgr::instance().setMaxSampleCountAllInternal(max_samples);
+    return (createAnswer(CONTROL_RESULT_SUCCESS,
+                         "All statistics count limit are set."));
+}
+
+bool
+StatsMgr::getStatName(const ConstElementPtr& params,
+                      string& name,
+                      string& reason) {
+    if (!params) {
+        reason = "Missing mandatory 'name' parameter.";
+        return (false);
+    }
+    ConstElementPtr stat_name = params->get("name");
+    if (!stat_name) {
+        reason = "Missing mandatory 'name' parameter.";
+        return (false);
+    }
+    if (stat_name->getType() != Element::string) {
+        reason = "'name' parameter expected to be a string.";
+        return (false);
+    }
+    name = stat_name->stringValue();
+    return (true);
+}
+
+bool
+StatsMgr::getStatDuration(const ConstElementPtr& params,
+                          StatsDuration& duration,
+                          string& reason) {
+    if (!params) {
+        reason = "Missing mandatory 'duration' parameter.";
+        return (false);
+    }
+    ConstElementPtr stat_duration = params->get("duration");
+    if (!stat_duration) {
+        reason = "Missing mandatory 'duration' parameter.";
+        return (false);
+    }
+    duration = std::chrono::seconds(stat_duration->intValue());
+    return (true);
+}
+
+bool
+StatsMgr::getStatMaxSamples(const ConstElementPtr& params,
+                            uint32_t& max_samples,
+                            string& reason) {
+    if (!params) {
+        reason = "Missing mandatory 'max-samples' parameter.";
+        return (false);
+    }
+    ConstElementPtr stat_max_samples = params->get("max-samples");
+    if (!stat_max_samples) {
+        reason = "Missing mandatory 'max-samples' parameter.";
+        return (false);
+    }
+    if (stat_max_samples->getType() != Element::integer) {
+        reason = "'max-samples' parameter expected to be an integer.";
+        return (false);
+    }
+    max_samples = stat_max_samples->intValue();
+    return (true);
+}
+
+} // end of namespace stats
+} // end of namespace isc
diff --git a/src/lib/stats/stats_mgr.h b/src/lib/stats/stats_mgr.h
new file mode 100644
index 0000000..f49ab8a
--- /dev/null
+++ b/src/lib/stats/stats_mgr.h
@@ -0,0 +1,805 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef STATSMGR_H
+#define STATSMGR_H
+
+#include <stats/observation.h>
+#include <stats/context.h>
+#include <util/bigints.h>
+
+#include <boost/noncopyable.hpp>
+#include <boost/scoped_ptr.hpp>
+
+#include <map>
+#include <mutex>
+#include <string>
+#include <vector>
+#include <sstream>
+
+namespace isc {
+namespace stats {
+
+/// @brief Statistics Manager class
+///
+/// StatsMgr is a singleton class that represents a subsystem that manages
+/// collection, storage and reporting of various types of statistics.
+/// It is also the intended API for both core code and hooks.
+///
+/// As of May 2015, Tomek ran performance benchmarks (see unit-tests in
+/// stats_mgr_unittest.cc with performance in their names) and it seems
+/// the code is able to register ~2.5-3 million observations per second, even
+/// with 1000 different statistics recorded. That seems sufficient for now,
+/// so there is no immediate need to develop any multi-threading solutions
+/// for now. However, should this decision be revised in the future, the
+/// best place for it would to be modify @ref addObservation method here.
+/// It's the common code point that all new observations must pass through.
+/// One possible way to enable multi-threading would be to run a separate
+/// thread handling collection. The main thread would call @ref addValue and
+/// @ref setValue methods that would end up calling @ref addObservation.
+/// That method would pass the data to separate thread to be collected and
+/// would immediately return. Further processing would be mostly as it
+/// is today, except happening in a separate thread. One unsolved issue in
+/// this approach is how to extract data, but that will remain unsolvable
+/// until we get the control socket implementation.
+///
+/// Statistics Manager does not use logging by design. The reasons are:
+/// - performance impact (logging every observation would degrade performance
+///   significantly. While it's possible to log on sufficiently high debug
+///   level, such a log would be not that useful)
+/// - dependency (statistics are intended to be a lightweight library, adding
+///   dependency on libkea-log, which has its own dependencies, including
+///   external log4cplus, is against 'lightweight' design)
+/// - if logging of specific statistics is warranted, it is recommended to
+///   add log entries in the code that calls StatsMgr.
+/// - enabling logging in StatsMgr does not offer fine tuning. It would be
+///   either all or nothing. Adding logging entries only when necessary
+///   in the code that uses StatsMgr gives better granularity.
+///
+/// If this decision is revisited in the future, the most universal places
+/// for adding logging have been marked in @ref addValueInternal and
+/// @ref setValueInternal.
+class StatsMgr : public boost::noncopyable {
+public:
+
+    /// @brief Statistics Manager accessor method.
+    static StatsMgr& instance();
+
+    /// @defgroup producer_methods Methods are used by data producers.
+    ///
+    /// @brief The following methods are used by data producers:
+    ///
+    /// @{
+
+    /// @brief Records absolute integer observation.
+    ///
+    /// @param name name of the observation
+    /// @param value integer value observed
+    /// @throw InvalidStatType if statistic is not integer
+    void setValue(const std::string& name, const int64_t value);
+
+    /// @brief Records an absolute big integer observation.
+    ///
+    /// @param name name of the observation
+    /// @param value integer value observed
+    /// @throw InvalidStatType if statistic is not integer
+    void setValue(const std::string& name, const isc::util::int128_t& value);
+
+    /// @brief Records absolute floating point observation.
+    ///
+    /// @param name name of the observation
+    /// @param value floating point value observed
+    /// @throw InvalidStatType if statistic is not fp
+    void setValue(const std::string& name, const double value);
+
+    /// @brief Records absolute duration observation.
+    ///
+    /// @param name name of the observation
+    /// @param value duration value observed
+    /// @throw InvalidStatType if statistic is not time duration
+    void setValue(const std::string& name, const StatsDuration& value);
+
+    /// @brief Records absolute string observation.
+    ///
+    /// @param name name of the observation
+    /// @param value string value observed
+    /// @throw InvalidStatType if statistic is not a string
+    void setValue(const std::string& name, const std::string& value);
+
+    /// @brief Records incremental integer observation.
+    ///
+    /// @param name name of the observation
+    /// @param value integer value observed
+    /// @throw InvalidStatType if statistic is not integer
+    void addValue(const std::string& name, const int64_t value);
+
+    /// @brief Records an incremental big integer observation.
+    ///
+    /// @param name name of the observation
+    /// @param value integer value observed
+    /// @throw InvalidStatType if statistic is not integer
+    void addValue(const std::string& name, const isc::util::int128_t& value);
+
+    /// @brief Records incremental floating point observation.
+    ///
+    /// @param name name of the observation
+    /// @param value floating point value observed
+    /// @throw InvalidStatType if statistic is not fp
+    void addValue(const std::string& name, const double value);
+
+    /// @brief Records incremental duration observation.
+    ///
+    /// @param name name of the observation
+    /// @param value duration value observed
+    /// @throw InvalidStatType if statistic is not time duration
+    void addValue(const std::string& name, const StatsDuration& value);
+
+    /// @brief Records incremental string observation.
+    ///
+    /// @param name name of the observation
+    /// @param value string value observed
+    /// @throw InvalidStatType if statistic is not a string
+    void addValue(const std::string& name, const std::string& value);
+
+    /// @brief Determines maximum age of samples.
+    ///
+    /// Specifies that statistic name should be stored not as a single value,
+    /// but rather as a set of values. duration determines the timespan.
+    /// Samples older than duration will be discarded. This is time-constrained
+    /// approach. For sample count constrained approach, see @ref
+    /// setMaxSampleCount() below.
+    /// Example:
+    /// To set a statistic to keep observations for the last 5 minutes, call:
+    /// setMaxSampleAge("incoming-packets", StatsDuration::minutes(5));
+    /// to revert statistic to a single value, call:
+    /// setMaxSampleAge("incoming-packets", StatsDuration:zero());
+    ///
+    /// @param name name of the observation
+    /// @param duration determines maximum age of samples
+    /// @return true if successful, false if there's no such statistic
+    bool setMaxSampleAge(const std::string& name, const StatsDuration& duration);
+
+    /// @brief Determines how many samples of a given statistic should be kept.
+    ///
+    /// Specifies that statistic name should be stored not as single value, but
+    /// rather as a set of values. In this form, at most max_samples will be kept.
+    /// When adding max_samples + 1 sample, the oldest sample will be discarded.
+    /// Example:
+    /// To set a statistic to keep the last 100 observations, call:
+    /// setMaxSampleCount("incoming-packets", 100);
+    ///
+    /// @param name name of the observation
+    /// @param max_samples how many samples of a given statistic should be kept
+    /// @return true if successful, false if there's no such statistic
+    bool setMaxSampleCount(const std::string& name, uint32_t max_samples);
+
+    /// @brief Set duration limit for all collected statistics.
+    ///
+    /// @param duration determines maximum age of samples
+    void setMaxSampleAgeAll(const StatsDuration& duration);
+
+    /// @brief Set count limit for all collected statistics.
+    ///
+    /// @param max_samples how many samples of a given statistic should be kept
+    void setMaxSampleCountAll(uint32_t max_samples);
+
+    /// @brief Set default duration limit.
+    ///
+    /// @param duration default maximum age of samples to keep
+    void setMaxSampleAgeDefault(const StatsDuration& duration);
+
+    /// @brief Set default count limit.
+    ///
+    /// @param max_samples default maximum number of samples to keep
+    /// (0 means to disable count limit and enable age limit)
+    void setMaxSampleCountDefault(uint32_t max_samples);
+
+    /// @brief Get default duration limit.
+    ///
+    /// @return default maximum age of samples to keep.
+    const StatsDuration& getMaxSampleAgeDefault() const;
+
+    /// @brief Get default count limit.
+    ///
+    /// @return default maximum number of samples to keep.
+    /// (0 means that count limit was disabled)
+    uint32_t getMaxSampleCountDefault() const;
+
+    /// @}
+
+    /// @defgroup consumer_methods Methods are used by data consumers.
+    ///
+    /// @brief The following methods are used by data consumers:
+    ///
+    /// @{
+
+    /// @brief Resets specified statistic.
+    ///
+    /// This is a convenience function and is equivalent to setValue(name,
+    /// neutral_value), where neutral_value is 0, 0.0 or "".
+    ///
+    /// @param name name of the statistic to be reset.
+    /// @return true if successful, false if there's no such statistic
+    bool reset(const std::string& name);
+
+    /// @brief Removes specified statistic.
+    ///
+    /// @param name name of the statistic to be removed.
+    /// @return true if successful, false if there's no such statistic
+    bool del(const std::string& name);
+
+    /// @brief Resets all collected statistics back to zero.
+    void resetAll();
+
+    /// @brief Removes all collected statistics.
+    /// @note This command was deprecated.
+    void removeAll();
+
+    /// @brief Returns size of specified statistic.
+    ///
+    /// @param name name of the statistic which size should be return.
+    /// @return size of specified statistic, 0 means lack of given statistic.
+    size_t getSize(const std::string& name) const;
+
+    /// @brief Returns number of available statistics.
+    ///
+    /// @return number of recorded statistics.
+    size_t count() const;
+
+    /// @brief Returns a single statistic as a JSON structure.
+    ///
+    /// @return JSON structures representing a single statistic
+    isc::data::ConstElementPtr get(const std::string& name) const;
+
+    /// @brief Returns all statistics as a JSON structure.
+    ///
+    /// @return JSON structures representing all statistics
+    isc::data::ConstElementPtr getAll() const;
+
+    /// @}
+
+    /// @brief Returns an observation.
+    ///
+    /// Used in testing only. Production code should use @ref get() method
+    /// when the value is dereferenced.
+    /// Calls @ref getObservationInternal() method in a thread safe context.
+    ///
+    /// @param name name of the statistic
+    /// @return Pointer to the Observation object
+    ObservationPtr getObservation(const std::string& name) const;
+
+    /// @brief Returns an observation in a thread safe context.
+    ///
+    /// Used in testing only. Production code should use @ref get() method
+    /// when the value is dereferenced. Should be called in a thread safe context.
+    ///
+    /// @param name name of the statistic
+    /// @return Pointer to the Observation object
+    ObservationPtr getObservationInternal(const std::string& name) const;
+
+    /// @brief Generates statistic name in a given context
+    ///
+    /// Example:
+    /// @code
+    /// generateName("subnet", 123, "received-packets");
+    /// @endcode
+    /// will return subnet[123].received-packets. Any printable type
+    /// can be used as index.
+    ///
+    /// @tparam Type any type that can be used to index contexts
+    /// @param context name of the context (e.g. 'subnet')
+    /// @param index value used for indexing contexts (e.g. subnet_id)
+    /// @param stat_name name of the statistic
+    /// @return returns full statistic name in form context[index].stat_name
+    template<typename Type>
+    static std::string generateName(const std::string& context, Type index,
+                                    const std::string& stat_name) {
+        std::stringstream name;
+        name << context << "[" << index << "]." << stat_name;
+        return (name.str());
+    }
+
+    /// @defgroup command_methods Methods are used to handle commands.
+    ///
+    /// @brief The following methods are used to handle commands:
+    ///
+    /// @{
+
+    /// @brief Handles statistic-get command
+    ///
+    /// This method handles statistic-get command, which returns value
+    /// of a given statistic). It expects one parameter stored in params map:
+    /// name: name of the statistic
+    ///
+    /// Example params structure:
+    /// {
+    ///     "name": "packets-received"
+    /// }
+    ///
+    /// @param name name of the command (ignored, should be "statistic-get")
+    /// @param params structure containing a map that contains "name"
+    /// @return answer containing details of specified statistic
+    static isc::data::ConstElementPtr
+    statisticGetHandler(const std::string& name,
+                        const isc::data::ConstElementPtr& params);
+
+    /// @brief Handles statistic-reset command
+    ///
+    /// This method handles statistic-reset command, which resets value
+    /// of a given statistic. It expects one parameter stored in params map:
+    /// name: name of the statistic
+    ///
+    /// Example params structure:
+    /// {
+    ///     "name": "packets-received"
+    /// }
+    ///
+    /// @param name name of the command (ignored, should be "statistic-reset")
+    /// @param params structure containing a map that contains "name"
+    /// @return answer containing confirmation
+    static isc::data::ConstElementPtr
+    statisticResetHandler(const std::string& name,
+                          const isc::data::ConstElementPtr& params);
+
+    /// @brief Handles statistic-remove command
+    ///
+    /// This method handles statistic-reset command, which removes a given
+    /// statistic completely. It expects one parameter stored in params map:
+    /// name: name of the statistic
+    ///
+    /// Example params structure:
+    /// {
+    ///     "name": "packets-received"
+    /// }
+    ///
+    /// @param name name of the command (ignored, should be "statistic-remove")
+    /// @param params structure containing a map that contains "name" element
+    /// @return answer containing confirmation
+    static isc::data::ConstElementPtr
+    statisticRemoveHandler(const std::string& name,
+                           const isc::data::ConstElementPtr& params);
+
+    /// @brief Handles statistic-sample-age-set command
+    ///
+    /// This method handles statistic-sample-age-set command,
+    /// which sets max_sample_age_ limit of a given statistic
+    /// and leaves max_sample_count_ disabled.
+    /// It expects two parameters stored in params map:
+    /// name: name of the statistic
+    /// duration: time limit expressed as a number of seconds
+    ///
+    /// Example params structure:
+    /// {
+    ///     "name": "packets-received",
+    ///     "duration": 1245
+    /// }
+    ///
+    /// @param name name of the command (ignored, should be "statistic-sample-age-set")
+    /// @param params structure containing a map that contains "name" and "duration"
+    /// @return answer containing information about successfully setup limit of statistic
+    static isc::data::ConstElementPtr
+    statisticSetMaxSampleAgeHandler(const std::string& name,
+                                    const isc::data::ConstElementPtr& params);
+
+    /// @brief Handles statistic-sample-count-set command
+    ///
+    /// This method handles statistic-sample-count-set command,
+    /// which sets max_sample_count_ limit of a given statistic
+    /// and leaves max_sample_age_ disabled.
+    /// It expects two parameters stored in params map:
+    /// name: name of the statistic
+    /// max-samples: count limit
+    ///
+    /// Example params structure:
+    /// {
+    ///     "name": "packets-received",
+    ///     "max-samples": 15
+    /// }
+    ///
+    /// @param name name of the command (ignored, should be "statistic-sample-count-set")
+    /// @param params structure containing a map that contains "name" and "max-samples"
+    /// @return answer containing information about successfully setup limit of statistic
+    static isc::data::ConstElementPtr
+    statisticSetMaxSampleCountHandler(const std::string& name,
+                                      const isc::data::ConstElementPtr& params);
+
+    /// @brief Handles statistic-get-all command
+    ///
+    /// This method handles statistic-get-all command, which returns values
+    /// of all statistics. Params parameter is ignored.
+    ///
+    /// @param name name of the command (ignored, should be "statistic-get-all")
+    /// @param params ignored
+    /// @return answer containing values of all statistic
+    static isc::data::ConstElementPtr
+    statisticGetAllHandler(const std::string& name,
+                           const isc::data::ConstElementPtr& params);
+
+    /// @brief Handles statistic-reset-all command
+    ///
+    /// This method handles statistic-reset-all command, which sets values of
+    /// all statistics back to zero. Params parameter is ignored.
+    ///
+    /// @param name name of the command (ignored, should be "statistic-reset-all")
+    /// @param params ignored
+    /// @return answer confirming success of this operation
+    static isc::data::ConstElementPtr
+    statisticResetAllHandler(const std::string& name,
+                             const isc::data::ConstElementPtr& params);
+
+    /// @brief Handles statistic-remove-all command
+    ///
+    /// @note The statistic-remove-all command was deprecated.
+    ///
+    /// This method handles statistic-remove-all command, which removes all
+    /// statistics. Params parameter is ignored.
+    ///
+    /// @param name name of the command (ignored, should be "statistic-remove-all")
+    /// @param params ignored
+    /// @return answer confirming success of this operation
+    static isc::data::ConstElementPtr
+    statisticRemoveAllHandler(const std::string& name,
+                              const isc::data::ConstElementPtr& params);
+
+    /// @brief Handles statistic-sample-age-set-all command
+    ///
+    /// This method handles statistic-sample-age-set-all command,
+    /// which sets max_sample_age_ limit to all statistics and the default.
+    /// It expects one parameter stored in params map:
+    /// duration: limit expressed as a number of seconds
+    ///
+    /// Example params structure:
+    /// {
+    ///     "duration": 1245
+    /// }
+    ///
+    /// @param params structure containing a map that contains "duration"
+    /// @return answer confirming success of this operation
+    isc::data::ConstElementPtr
+    statisticSetMaxSampleAgeAllHandler(const isc::data::ConstElementPtr& params);
+
+    /// @brief Handles statistic-sample-count-set-all command
+    ///
+    /// This method handles statistic-sample-count-set-all command,
+    /// which sets max_sample_count_ limit of all statistics and the default.
+    /// It expects one parameter stored in params map:
+    /// max-samples: count limit
+    /// The value 0 is out of range.
+    ///
+    /// Example params structure:
+    /// {
+    ///     "max-samples": 15
+    /// }
+    ///
+    /// @param params structure containing a map that contains "max-samples"
+    /// @return answer confirming success of this operation
+    isc::data::ConstElementPtr
+    statisticSetMaxSampleCountAllHandler(const isc::data::ConstElementPtr& params);
+
+    /// @}
+
+private:
+
+    /// @private
+
+    /// @brief Private constructor.
+    ///
+    /// StatsMgr is a singleton. It should be accessed using @ref instance
+    /// method.
+    StatsMgr();
+
+    /// @public
+
+    /// @brief Sets a given statistic to specified value (internal version).
+    ///
+    /// This template method sets statistic identified by name to a value
+    /// specified by value. This internal method is used by public @ref setValue
+    /// methods.
+    ///
+    /// @tparam DataType one of int64_t, double, StatsDuration or string
+    /// @param name name of the statistic
+    /// @param value specified statistic will be set to this value
+    /// @throw InvalidStatType is statistic exists and has a different type.
+    template<typename DataType>
+    void setValueInternal(const std::string& name, DataType value) {
+        // If we want to log each observation, here would be the best place for it.
+        ObservationPtr stat = getObservationInternal(name);
+        if (stat) {
+            stat->setValue(value);
+        } else {
+            stat.reset(new Observation(name, value));
+            addObservationInternal(stat);
+        }
+    }
+
+    /// @public
+
+    /// @brief Adds specified value to a given statistic (internal version).
+    ///
+    /// This template method adds specified value to a given statistic (identified
+    /// by name to a value). This internal method is used by public @ref setValue
+    /// methods.
+    ///
+    /// @tparam DataType one of int64_t, double, StatsDuration or string
+    /// @param name name of the statistic
+    /// @param value specified statistic will be set to this value
+    /// @throw InvalidStatType is statistic exists and has a different type.
+    template<typename DataType>
+    void addValueInternal(const std::string& name, DataType value) {
+        // If we want to log each observation, here would be the best place for it.
+        ObservationPtr existing = getObservationInternal(name);
+        if (!existing) {
+            // We tried to add to a non-existing statistic. We can recover from
+            // that. Simply add the new incremental value as a new statistic and
+            // we're done.
+            setValueInternal(name, value);
+            return;
+        } else {
+            // Let's hope it is of correct type. If not, the underlying
+            // addValue() method will throw.
+            existing->addValue(value);
+        }
+    }
+
+    /// @public
+
+    /// @brief Adds a new observation.
+    ///
+    /// That's an utility method used by public @ref setValue() and
+    /// @ref addValue() methods.
+    /// Calls @ref addObservationInternal() method in a thread safe context.
+    ///
+    /// @param stat observation
+    void addObservation(const ObservationPtr& stat);
+
+    /// @public
+
+    /// @brief Adds a new observation in a thread safe context.
+    ///
+    /// That's an utility method used by public @ref setValue() and
+    /// @ref addValue() methods.
+    /// Should be called in a thread safe context.
+    ///
+    /// @param stat observation
+    void addObservationInternal(const ObservationPtr& stat);
+
+    /// @private
+
+    /// @brief Tries to delete an observation.
+    ///
+    /// Calls @ref deleteObservationInternal() method in a thread safe context.
+    ///
+    /// @param name of the statistic to be deleted
+    /// @return true if deleted, false if not found
+    bool deleteObservation(const std::string& name);
+
+    /// @private
+
+    /// @brief Tries to delete an observation in a thread safe context.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @param name of the statistic to be deleted
+    /// @return true if deleted, false if not found
+    bool deleteObservationInternal(const std::string& name);
+
+    /// @private
+
+    /// @brief Determines maximum age of samples.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @param name name of the observation
+    /// @param duration determines maximum age of samples
+    /// @return true if successful, false if there's no such statistic
+    bool setMaxSampleAgeInternal(const std::string& name, const StatsDuration& duration);
+
+    /// @private
+
+    /// @brief Determines how many samples of a given statistic should be kept.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @param name name of the observation
+    /// @param max_samples how many samples of a given statistic should be kept
+    /// @return true if successful, false if there's no such statistic
+    bool setMaxSampleCountInternal(const std::string& name, uint32_t max_samples);
+
+    /// @private
+
+    /// @brief Set duration limit for all collected statistics.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @param duration determines maximum age of samples
+    void setMaxSampleAgeAllInternal(const StatsDuration& duration);
+
+    /// @private
+
+    /// @brief Set count limit for all collected statistics.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @param max_samples how many samples of a given statistic should be kept
+    void setMaxSampleCountAllInternal(uint32_t max_samples);
+
+    /// @private
+
+    /// @brief Set default duration limit.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @param duration default maximum age of samples to keep.
+    void setMaxSampleAgeDefaultInternal(const StatsDuration& duration);
+
+    /// @brief Set default count limit.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @param max_samples default maximum number of samples to keep.
+    /// (0 means to disable count limit and enable age limit)
+    void setMaxSampleCountDefaultInternal(uint32_t max_samples);
+
+    /// @private
+
+    /// @brief Get default duration limit.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @return default maximum age of samples to keep.
+    const StatsDuration& getMaxSampleAgeDefaultInternal() const;
+
+    /// @brief Get default count limit.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @return default maximum number of samples to keep.
+    /// (0 means that count limit was disabled)
+    uint32_t getMaxSampleCountDefaultInternal() const;
+
+    /// @private
+
+    /// @brief Resets specified statistic.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @param name name of the statistic to be reset.
+    /// @return true if successful, false if there's no such statistic
+    bool resetInternal(const std::string& name);
+
+    /// @private
+
+    /// @brief Removes specified statistic.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @param name name of the statistic to be removed.
+    /// @return true if successful, false if there's no such statistic
+    bool delInternal(const std::string& name);
+
+    /// @private
+
+    /// @brief Resets all collected statistics back to zero.
+    ///
+    /// Should be called in a thread safe context.
+    void resetAllInternal();
+
+    /// @private
+
+    /// @brief Removes all collected statistics.
+    ///
+    /// Should be called in a thread safe context.
+    void removeAllInternal();
+
+    /// @private
+
+    /// @brief Returns size of specified statistic.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @param name name of the statistic which size should be return.
+    /// @return size of specified statistic, 0 means lack of given statistic.
+    size_t getSizeInternal(const std::string& name) const;
+
+    /// @private
+
+    /// @brief Returns number of available statistics.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @return number of recorded statistics.
+    size_t countInternal() const;
+
+    /// @private
+
+    /// @brief Returns a single statistic as a JSON structure.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @return JSON structures representing a single statistic
+    isc::data::ConstElementPtr getInternal(const std::string& name) const;
+
+    /// @private
+
+    /// @brief Returns all statistics as a JSON structure.
+    ///
+    /// Should be called in a thread safe context.
+    ///
+    /// @return JSON structures representing all statistics
+    isc::data::ConstElementPtr getAllInternal() const;
+
+    /// @private
+
+    /// @brief Utility method that attempts to extract statistic name
+    ///
+    /// This method attempts to extract statistic name from the params
+    /// structure. It is expected to be a map that contains 'name' element,
+    /// that is of type string. If present as expected, statistic name
+    /// set and true is returned. If missing or is of incorrect type, the reason
+    /// is specified in reason parameter and false is returned.
+    ///
+    /// @param params parameters structure received in command
+    /// @param name [out] name of the statistic (if no error detected)
+    /// @param reason [out] failure reason (if error is detected)
+    /// @return true (if everything is ok), false otherwise
+    static bool getStatName(const isc::data::ConstElementPtr& params,
+                            std::string& name,
+                            std::string& reason);
+
+    /// @private
+
+    /// @brief Utility method that attempts to extract duration limit for
+    /// a given statistic
+    ///
+    /// This method attempts to extract duration limit for a given statistic
+    /// from the params structure.
+    /// It is expected to be a map that contains four 'duration' elements: 'hours',
+    /// 'minutes', 'seconds' and 'milliseconds'
+    /// all are of type int. If present as expected, statistic duration
+    /// limit is set and true is returned.
+    /// If any of these four parameters is missing or is of incorrect type,
+    /// the reason is specified in reason parameter and false is returned.
+    ///
+    /// @param params parameters structure received in command
+    /// @param duration [out] duration limit for the statistic (if no error detected)
+    /// @param reason [out] failure reason (if error is detected)
+    /// @return true (if everything is ok), false otherwise
+    static bool getStatDuration(const isc::data::ConstElementPtr& params,
+                                StatsDuration& duration,
+                                std::string& reason);
+
+    /// @private
+
+    /// @brief Utility method that attempts to extract count limit for
+    /// a given statistic
+    ///
+    /// This method attempts to extract count limit for a given statistic
+    /// from the params structure.
+    /// It is expected to be a map that contains 'max-samples' element,
+    /// that is of type int. If present as expected, statistic count
+    /// limit (max_samples) is set and true is returned.
+    /// If missing or is of incorrect type, the reason is specified in reason
+    /// parameter and false is returned.
+    ///
+    /// @param params parameters structure received in command
+    /// @param max_samples [out] count limit for the statistic (if no error detected)
+    /// @param reason [out] failure reason (if error is detected)
+    /// @return true (if everything is ok), false otherwise
+    static bool getStatMaxSamples(const isc::data::ConstElementPtr& params,
+                                  uint32_t& max_samples,
+                                  std::string& reason);
+
+    /// @brief This is a global context. All statistics will initially be stored here.
+    StatContextPtr global_;
+
+    /// @brief The mutex used to protect internal state.
+    const boost::scoped_ptr<std::mutex> mutex_;
+};
+
+}  // namespace stats
+}  // namespace isc
+
+#endif // STATS_MGR
diff --git a/src/lib/stats/tests/Makefile.am b/src/lib/stats/tests/Makefile.am
new file mode 100644
index 0000000..138a657
--- /dev/null
+++ b/src/lib/stats/tests/Makefile.am
@@ -0,0 +1,37 @@
+SUBDIRS = .
+
+AM_CPPFLAGS = -I$(top_builddir)/src/lib -I$(top_srcdir)/src/lib
+AM_CPPFLAGS += $(BOOST_INCLUDES)
+
+AM_CXXFLAGS = $(KEA_CXXFLAGS)
+
+if USE_STATIC_LINK
+AM_LDFLAGS = -static
+endif
+
+TESTS_ENVIRONMENT = $(LIBTOOL) --mode=execute $(VALGRIND_COMMAND)
+
+if HAVE_GTEST
+
+TESTS = libstats_unittests
+
+libstats_unittests_SOURCES  = run_unittests.cc
+libstats_unittests_SOURCES += observation_unittest.cc
+libstats_unittests_SOURCES += context_unittest.cc
+libstats_unittests_SOURCES += stats_mgr_unittest.cc
+
+libstats_unittests_CPPFLAGS = $(AM_CPPFLAGS) $(GTEST_INCLUDES)
+libstats_unittests_LDFLAGS  = $(AM_LDFLAGS)  $(GTEST_LDFLAGS)
+libstats_unittests_CXXFLAGS = $(AM_CXXFLAGS)
+
+libstats_unittests_LDADD  = $(top_builddir)/src/lib/stats/libkea-stats.la
+libstats_unittests_LDADD += $(top_builddir)/src/lib/cc/libkea-cc.la
+libstats_unittests_LDADD += $(top_builddir)/src/lib/asiolink/libkea-asiolink.la
+libstats_unittests_LDADD += $(top_builddir)/src/lib/log/libkea-log.la
+libstats_unittests_LDADD += $(top_builddir)/src/lib/util/libkea-util.la
+libstats_unittests_LDADD += $(top_builddir)/src/lib/exceptions/libkea-exceptions.la
+libstats_unittests_LDADD += $(LOG4CPLUS_LIBS) $(GTEST_LDADD) $(BOOST_LIBS)
+
+endif
+
+noinst_PROGRAMS = $(TESTS)
diff --git a/src/lib/stats/tests/Makefile.in b/src/lib/stats/tests/Makefile.in
new file mode 100644
index 0000000..beee81b
--- /dev/null
+++ b/src/lib/stats/tests/Makefile.in
@@ -0,0 +1,1042 @@
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+# @configure_input@
+
+# Copyright (C) 1994-2018 Free Software Foundation, Inc.
+
+# This Makefile.in is free software; the Free Software Foundation
+# gives unlimited permission to copy and/or distribute it,
+# with or without modifications, as long as this notice is preserved.
+
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY, to the extent permitted by law; without
+# even the implied warranty of MERCHANTABILITY or FITNESS FOR A
+# PARTICULAR PURPOSE.
+
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+
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+am__is_gnu_make = { \
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+  elif test -n '$(MAKE_HOST)'; then \
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+  else \
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+}
+am__make_running_with_option = \
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+      ?) ;; \
+      *) echo "am__make_running_with_option: internal error: invalid" \
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+         exit 1;; \
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+  has_opt=no; \
+  sane_makeflags=$$MAKEFLAGS; \
+  if $(am__is_gnu_make); then \
+    sane_makeflags=$$MFLAGS; \
+  else \
+    case $$MAKEFLAGS in \
+      *\\[\ \	]*) \
+        bs=\\; \
+        sane_makeflags=`printf '%s\n' "$$MAKEFLAGS" \
+          | sed "s/$$bs$$bs[$$bs $$bs	]*//g"`;; \
+    esac; \
+  fi; \
+  skip_next=no; \
+  strip_trailopt () \
+  { \
+    flg=`printf '%s\n' "$$flg" | sed "s/$$1.*$$//"`; \
+  }; \
+  for flg in $$sane_makeflags; do \
+    test $$skip_next = yes && { skip_next=no; continue; }; \
+    case $$flg in \
+      *=*|--*) continue;; \
+        -*I) strip_trailopt 'I'; skip_next=yes;; \
+      -*I?*) strip_trailopt 'I';; \
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+      -*O?*) strip_trailopt 'O';; \
+        -*l) strip_trailopt 'l'; skip_next=yes;; \
+      -*l?*) strip_trailopt 'l';; \
+      -[dEDm]) skip_next=yes;; \
+      -[JT]) skip_next=yes;; \
+    esac; \
+    case $$flg in \
+      *$$target_option*) has_opt=yes; break;; \
+    esac; \
+  done; \
+  test $$has_opt = yes
+am__make_dryrun = (target_option=n; $(am__make_running_with_option))
+am__make_keepgoing = (target_option=k; $(am__make_running_with_option))
+pkgdatadir = $(datadir)/@PACKAGE@
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+	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
+	list='$(DISTFILES)'; \
+	  dist_files=`for file in $$list; do echo $$file; done | \
+	  sed -e "s|^$$srcdirstrip/||;t" \
+	      -e "s|^$$topsrcdirstrip/|$(top_builddir)/|;t"`; \
+	case $$dist_files in \
+	  */*) $(MKDIR_P) `echo "$$dist_files" | \
+			   sed '/\//!d;s|^|$(distdir)/|;s,/[^/]*$$,,' | \
+			   sort -u` ;; \
+	esac; \
+	for file in $$dist_files; do \
+	  if test -f $$file || test -d $$file; then d=.; else d=$(srcdir); fi; \
+	  if test -d $$d/$$file; then \
+	    dir=`echo "/$$file" | sed -e 's,/[^/]*$$,,'`; \
+	    if test -d "$(distdir)/$$file"; then \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    if test -d $(srcdir)/$$file && test $$d != $(srcdir); then \
+	      cp -fpR $(srcdir)/$$file "$(distdir)$$dir" || exit 1; \
+	      find "$(distdir)/$$file" -type d ! -perm -700 -exec chmod u+rwx {} \;; \
+	    fi; \
+	    cp -fpR $$d/$$file "$(distdir)$$dir" || exit 1; \
+	  else \
+	    test -f "$(distdir)/$$file" \
+	    || cp -p $$d/$$file "$(distdir)/$$file" \
+	    || exit 1; \
+	  fi; \
+	done
+	@list='$(DIST_SUBDIRS)'; for subdir in $$list; do \
+	  if test "$$subdir" = .; then :; else \
+	    $(am__make_dryrun) \
+	      || test -d "$(distdir)/$$subdir" \
+	      || $(MKDIR_P) "$(distdir)/$$subdir" \
+	      || exit 1; \
+	    dir1=$$subdir; dir2="$(distdir)/$$subdir"; \
+	    $(am__relativize); \
+	    new_distdir=$$reldir; \
+	    dir1=$$subdir; dir2="$(top_distdir)"; \
+	    $(am__relativize); \
+	    new_top_distdir=$$reldir; \
+	    echo " (cd $$subdir && $(MAKE) $(AM_MAKEFLAGS) top_distdir="$$new_top_distdir" distdir="$$new_distdir" \\"; \
+	    echo "     am__remove_distdir=: am__skip_length_check=: am__skip_mode_fix=: distdir)"; \
+	    ($(am__cd) $$subdir && \
+	      $(MAKE) $(AM_MAKEFLAGS) \
+	        top_distdir="$$new_top_distdir" \
+	        distdir="$$new_distdir" \
+		am__remove_distdir=: \
+		am__skip_length_check=: \
+		am__skip_mode_fix=: \
+	        distdir) \
+	      || exit 1; \
+	  fi; \
+	done
+check-am: all-am
+	$(MAKE) $(AM_MAKEFLAGS) check-TESTS
+check: check-recursive
+all-am: Makefile $(PROGRAMS)
+installdirs: installdirs-recursive
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+install: install-recursive
+install-exec: install-exec-recursive
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+install-am: all-am
+	@$(MAKE) $(AM_MAKEFLAGS) install-exec-am install-data-am
+
+installcheck: installcheck-recursive
+install-strip:
+	if test -z '$(STRIP)'; then \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	      install; \
+	else \
+	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
+	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
+	    "INSTALL_PROGRAM_ENV=STRIPPROG='$(STRIP)'" install; \
+	fi
+mostlyclean-generic:
+
+clean-generic:
+
+distclean-generic:
+	-test -z "$(CONFIG_CLEAN_FILES)" || rm -f $(CONFIG_CLEAN_FILES)
+	-test . = "$(srcdir)" || test -z "$(CONFIG_CLEAN_VPATH_FILES)" || rm -f $(CONFIG_CLEAN_VPATH_FILES)
+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-recursive
+
+clean-am: clean-generic clean-libtool clean-noinstPROGRAMS \
+	mostlyclean-am
+
+distclean: distclean-recursive
+		-rm -f ./$(DEPDIR)/libstats_unittests-context_unittest.Po
+	-rm -f ./$(DEPDIR)/libstats_unittests-observation_unittest.Po
+	-rm -f ./$(DEPDIR)/libstats_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/libstats_unittests-stats_mgr_unittest.Po
+	-rm -f Makefile
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+	distclean-tags
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+		-rm -f ./$(DEPDIR)/libstats_unittests-context_unittest.Po
+	-rm -f ./$(DEPDIR)/libstats_unittests-observation_unittest.Po
+	-rm -f ./$(DEPDIR)/libstats_unittests-run_unittests.Po
+	-rm -f ./$(DEPDIR)/libstats_unittests-stats_mgr_unittest.Po
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
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+mostlyclean: mostlyclean-recursive
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+	mostlyclean-libtool
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+.MAKE: $(am__recursive_targets) check-am install-am install-strip
+
+.PHONY: $(am__recursive_targets) CTAGS GTAGS TAGS all all-am \
+	am--depfiles check check-TESTS check-am clean clean-generic \
+	clean-libtool clean-noinstPROGRAMS cscopelist-am ctags \
+	ctags-am distclean distclean-compile distclean-generic \
+	distclean-libtool distclean-tags distdir dvi dvi-am html \
+	html-am info info-am install install-am install-data \
+	install-data-am install-dvi install-dvi-am install-exec \
+	install-exec-am install-html install-html-am install-info \
+	install-info-am install-man install-pdf install-pdf-am \
+	install-ps install-ps-am install-strip installcheck \
+	installcheck-am installdirs installdirs-am maintainer-clean \
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+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/stats/tests/context_unittest.cc b/src/lib/stats/tests/context_unittest.cc
new file mode 100644
index 0000000..92c754c
--- /dev/null
+++ b/src/lib/stats/tests/context_unittest.cc
@@ -0,0 +1,126 @@
+// Copyright (C) 2015-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <stats/context.h>
+#include <gtest/gtest.h>
+#include <util/chrono_time_utils.h>
+#include <string>
+
+using namespace isc::data;
+using namespace isc::stats;
+using namespace std;
+using namespace std::chrono;
+
+// Basic test that checks get, add, del methods
+TEST(ContextTest, basic) {
+
+    // Let's create a couple observations. Using floating point,
+    // as they're easiest to initialize.
+    ObservationPtr a(new Observation("alpha", 1.11));
+    ObservationPtr b(new Observation("beta", 2.22));
+    ObservationPtr c(new Observation("gamma", 3.33));
+    string expected_a = a->getJSON()->str();
+    string expected_b = b->getJSON()->str();
+    string expected_c = c->getJSON()->str();
+
+
+    // Context where we will store the observations.
+    StatContext ctx;
+
+    // By default the context does not hold any statistics.
+    EXPECT_EQ(0, ctx.size());
+
+    // It should be possible to add 'a' statistic
+    EXPECT_NO_THROW(ctx.add(a));
+
+    // We can't add a duplicate.
+    EXPECT_THROW(ctx.add(a), DuplicateStat);
+
+    // It should be ok to add other statistics
+    EXPECT_NO_THROW(ctx.add(b));
+    EXPECT_NO_THROW(ctx.add(c));
+
+    // By now we should have 3 statistics recorded
+    EXPECT_EQ(3, ctx.size());
+
+    // Let's try to retrieve them
+    ObservationPtr from_ctx;
+    EXPECT_NO_THROW(from_ctx = ctx.get("alpha"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(expected_a, from_ctx->getJSON()->str());
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("beta"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(expected_b, from_ctx->getJSON()->str());
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("gamma"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(expected_c, from_ctx->getJSON()->str());
+
+    // Let's try to retrieve non-existing stat
+    EXPECT_NO_THROW(from_ctx = ctx.get("delta"));
+    EXPECT_FALSE(from_ctx);
+
+    // Now delete one of the stats...
+    EXPECT_TRUE(ctx.del("beta"));
+
+    // ... and check that it's really gone.
+    EXPECT_FALSE(ctx.get("beta"));
+
+    // Attempt to delete non-existing stat should fail.
+    EXPECT_FALSE(ctx.del("beta"));
+
+    ConstElementPtr result;
+    EXPECT_NO_THROW(result = ctx.getAll());
+
+    ASSERT_TRUE(result);
+    ElementPtr expected_result = Element::createMap();
+    expected_result->set("alpha", a->getJSON());
+    expected_result->set("gamma", c->getJSON());
+    EXPECT_EQ(result->str(), expected_result->str());
+
+    // Reset all statistics.
+    EXPECT_NO_THROW(ctx.resetAll());
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("alpha"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_NE(expected_a, from_ctx->getJSON()->str());
+    EXPECT_EQ(0.0, a->getFloat().first);
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("gamma"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_NE(expected_c, from_ctx->getJSON()->str());
+    EXPECT_EQ(0.0, c->getFloat().first);
+
+    // Set sample count for all statistics
+    EXPECT_NO_THROW(ctx.setMaxSampleCountAll(50));
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("alpha"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(from_ctx->getMaxSampleCount().second, 50);
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("gamma"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(from_ctx->getMaxSampleCount().second, 50);
+
+    // Set sample age for all statistics
+    const StatsDuration& dur(minutes(4) + seconds(5) + milliseconds(3));
+    EXPECT_NO_THROW(ctx.setMaxSampleAgeAll(dur));
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("alpha"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(from_ctx->getMaxSampleAge().second, dur);
+
+    EXPECT_NO_THROW(from_ctx = ctx.get("gamma"));
+    ASSERT_TRUE(from_ctx);
+    EXPECT_EQ(from_ctx->getMaxSampleAge().second, dur);
+
+    // Clear all statistics.
+    EXPECT_NO_THROW(ctx.clear());
+    EXPECT_EQ(0, ctx.size());
+}
diff --git a/src/lib/stats/tests/observation_unittest.cc b/src/lib/stats/tests/observation_unittest.cc
new file mode 100644
index 0000000..63fbece
--- /dev/null
+++ b/src/lib/stats/tests/observation_unittest.cc
@@ -0,0 +1,717 @@
+// Copyright (C) 2015-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <exceptions/exceptions.h>
+#include <stats/observation.h>
+#include <util/chrono_time_utils.h>
+#include <util/bigints.h>
+
+#include <boost/shared_ptr.hpp>
+
+#include <gtest/gtest.h>
+
+#include <iostream>
+#include <sstream>
+
+#include <unistd.h>
+
+using namespace isc;
+using namespace isc::stats;
+using namespace isc::util;
+using namespace std::chrono;
+
+namespace {
+
+static const StatsDuration& dur1234(hours(1) + minutes(2) + seconds(3) +
+                                    milliseconds(4));
+static const StatsDuration& dur5678(hours(5) + minutes(6) + seconds(7) +
+                                    milliseconds(8));
+static const StatsDuration& dur681012(hours(6) + minutes(8) + seconds(10) +
+                                      milliseconds(12));
+static const StatsDuration& dur453(minutes(4) + seconds(5) + milliseconds(3));
+
+// This test verifies that the number of seconds can be retrieved.
+TEST(StatsDurationTest, toSeconds) {
+    StatsDuration dur = StatsDuration::zero();
+    dur += hours(1) + minutes(1) + seconds(1) + milliseconds(1);
+    EXPECT_EQ(3661, toSeconds(dur));
+}
+
+/// @brief Test class for Observation
+///
+/// This simple fixture class initializes four observations:
+/// a (integer), b (float), c(time duration) and d (string).
+class ObservationTest : public ::testing::Test {
+public:
+
+    /// @brief Constructor
+    /// Initializes four observations.
+    ObservationTest() :
+        a("alpha", static_cast<int64_t>(1234)), // integer
+        b("beta", 12.34), // float
+        c("gamma", dur1234), // duration
+        d("delta", "1234"), // string
+        e("epsilon", int128_t(12e34)) { // big integer
+    }
+
+    Observation a;
+    Observation b;
+    Observation c;
+    Observation d;
+    Observation e;
+};
+
+// Basic tests for the Observation constructors. This test checks whether
+// parameters passed to the constructor initialize the object properly.
+TEST_F(ObservationTest, constructor) {
+    EXPECT_EQ(Observation::STAT_INTEGER, a.getType());
+    EXPECT_EQ(Observation::STAT_FLOAT, b.getType());
+    EXPECT_EQ(Observation::STAT_DURATION, c.getType());
+    EXPECT_EQ(Observation::STAT_STRING, d.getType());
+    EXPECT_EQ(Observation::STAT_BIG_INTEGER, e.getType());
+
+    EXPECT_EQ(1234, a.getInteger().first);
+    EXPECT_EQ(12.34, b.getFloat().first);
+    EXPECT_EQ(dur1234, c.getDuration().first);
+    EXPECT_EQ("1234", d.getString().first);
+    EXPECT_EQ(int128_t(12e34), e.getBigInteger().first);
+
+    // Let's check that attempting to get a different type
+    // than used will cause an exception.
+    EXPECT_THROW(a.getFloat(), InvalidStatType);
+    EXPECT_THROW(a.getDuration(), InvalidStatType);
+    EXPECT_THROW(a.getString(), InvalidStatType);
+    EXPECT_THROW(a.getBigInteger(), InvalidStatType);
+
+    EXPECT_THROW(b.getInteger(), InvalidStatType);
+    EXPECT_THROW(b.getDuration(), InvalidStatType);
+    EXPECT_THROW(b.getString(), InvalidStatType);
+    EXPECT_THROW(b.getBigInteger(), InvalidStatType);
+
+    EXPECT_THROW(c.getInteger(), InvalidStatType);
+    EXPECT_THROW(c.getFloat(), InvalidStatType);
+    EXPECT_THROW(c.getString(), InvalidStatType);
+    EXPECT_THROW(c.getBigInteger(), InvalidStatType);
+
+    EXPECT_THROW(d.getInteger(), InvalidStatType);
+    EXPECT_THROW(d.getFloat(), InvalidStatType);
+    EXPECT_THROW(d.getDuration(), InvalidStatType);
+    EXPECT_THROW(d.getBigInteger(), InvalidStatType);
+
+    EXPECT_THROW(e.getInteger(), InvalidStatType);
+    EXPECT_THROW(e.getFloat(), InvalidStatType);
+    EXPECT_THROW(e.getDuration(), InvalidStatType);
+    EXPECT_THROW(e.getString(), InvalidStatType);
+}
+
+// This test checks whether it is possible to set to an absolute value for all
+// given types.
+TEST_F(ObservationTest, setValue) {
+    EXPECT_NO_THROW(a.setValue(static_cast<int64_t>(5678)));
+    EXPECT_NO_THROW(b.setValue(56e+78));
+    EXPECT_NO_THROW(c.setValue(dur5678));
+    EXPECT_NO_THROW(d.setValue("fiveSixSevenEight"));
+    EXPECT_NO_THROW(e.setValue(int128_t(43e21)));
+
+    EXPECT_EQ(5678, a.getInteger().first);
+    EXPECT_EQ(56e+78, b.getFloat().first);
+    EXPECT_EQ(dur5678, c.getDuration().first);
+    EXPECT_EQ("fiveSixSevenEight", d.getString().first);
+    EXPECT_EQ(int128_t(43e21), e.getBigInteger().first);
+
+    // Now check whether setting value to a different type does
+    // throw an exception
+    EXPECT_THROW(a.setValue(56e+78), InvalidStatType);
+    EXPECT_THROW(a.setValue(dur5678), InvalidStatType);
+    EXPECT_THROW(a.setValue("fiveSixSevenEight"), InvalidStatType);
+    EXPECT_THROW(a.setValue(int128_t(43e21)), InvalidStatType);
+
+    EXPECT_THROW(b.setValue(static_cast<int64_t>(5678)), InvalidStatType);
+    EXPECT_THROW(b.setValue(dur5678), InvalidStatType);
+    EXPECT_THROW(b.setValue("fiveSixSevenEight"), InvalidStatType);
+    EXPECT_THROW(b.setValue(int128_t(43e21)), InvalidStatType);
+
+    EXPECT_THROW(c.setValue(static_cast<int64_t>(5678)), InvalidStatType);
+    EXPECT_THROW(c.setValue(56e+78), InvalidStatType);
+    EXPECT_THROW(c.setValue("fiveSixSevenEight"), InvalidStatType);
+    EXPECT_THROW(c.setValue(int128_t(43e21)), InvalidStatType);
+
+    EXPECT_THROW(d.setValue(static_cast<int64_t>(5678)), InvalidStatType);
+    EXPECT_THROW(d.setValue(56e+78), InvalidStatType);
+    EXPECT_THROW(d.setValue(dur5678), InvalidStatType);
+    EXPECT_THROW(d.setValue(int128_t(43e21)), InvalidStatType);
+
+    EXPECT_THROW(e.setValue(int64_t(5678)), InvalidStatType);
+    EXPECT_THROW(e.setValue(56e+78), InvalidStatType);
+    EXPECT_THROW(e.setValue(dur5678), InvalidStatType);
+    EXPECT_THROW(e.setValue("fiveSixSevenEight"), InvalidStatType);
+}
+
+// This test checks whether it is possible to add value to existing
+// counter.
+TEST_F(ObservationTest, addValue) {
+    // Note: all Observations were set to 1234, 12.34 or similar in
+    // ObservationTest constructor.
+
+    EXPECT_NO_THROW(a.addValue(static_cast<int64_t>(5678)));
+    EXPECT_NO_THROW(b.addValue(56.78));
+    EXPECT_NO_THROW(c.addValue(dur5678));
+    EXPECT_NO_THROW(d.addValue("fiveSixSevenEight"));
+    EXPECT_NO_THROW(e.addValue(int128_t(43e21)));
+
+    EXPECT_EQ(6912, a.getInteger().first);
+    EXPECT_EQ(69.12, b.getFloat().first);
+    EXPECT_EQ(dur681012, c.getDuration().first);
+    EXPECT_EQ("1234fiveSixSevenEight", d.getString().first);
+    EXPECT_EQ(int128_t(12e34) + int128_t(43e21), e.getBigInteger().first);
+
+    ASSERT_EQ(a.getSize(), 2);
+    ASSERT_EQ(b.getSize(), 2);
+    ASSERT_EQ(c.getSize(), 2);
+    ASSERT_EQ(d.getSize(), 2);
+    ASSERT_EQ(e.getSize(), 2);
+}
+
+// This test checks if collecting more than one sample
+// works well.
+TEST_F(ObservationTest, moreThanOne) {
+    // Arrays of 4 types of samples
+    int64_t int_samples[3] = {1234, 6912, 5678};
+    double float_samples[3] = {12.34, 69.12, 56e+78};
+    StatsDuration duration_samples[3] = {dur1234, dur681012, dur5678};
+    std::string string_samples[3] = {"1234", "1234fiveSixSevenEight", "fiveSixSevenEight"};
+    int128_t bigint_samples[3] = {int128_t(12e34), int128_t(12e34) + int128_t(43e21),
+                                  int128_t(43e21)};
+
+    EXPECT_NO_THROW(a.addValue(static_cast<int64_t>(5678)));
+    EXPECT_NO_THROW(b.addValue(56.78));
+    EXPECT_NO_THROW(c.addValue(dur5678));
+    EXPECT_NO_THROW(d.addValue("fiveSixSevenEight"));
+    EXPECT_NO_THROW(e.addValue(int128_t(43e21)));
+
+    EXPECT_NO_THROW(a.setValue(static_cast<int64_t>(5678)));
+    EXPECT_NO_THROW(b.setValue(56e+78));
+    EXPECT_NO_THROW(c.setValue(dur5678));
+    EXPECT_NO_THROW(d.setValue("fiveSixSevenEight"));
+    EXPECT_NO_THROW(e.setValue(int128_t(43e21)));
+
+    ASSERT_EQ(a.getSize(), 3);
+    ASSERT_EQ(b.getSize(), 3);
+    ASSERT_EQ(c.getSize(), 3);
+    ASSERT_EQ(d.getSize(), 3);
+    ASSERT_EQ(e.getSize(), 3);
+
+    ASSERT_NO_THROW(a.getIntegers());
+    ASSERT_NO_THROW(b.getFloats());
+    ASSERT_NO_THROW(c.getDurations());
+    ASSERT_NO_THROW(d.getStrings());
+    ASSERT_NO_THROW(e.getBigIntegers());
+
+    std::list<IntegerSample> samples_int = a.getIntegers(); // List of all integer samples
+    std::list<FloatSample> samples_float = b.getFloats(); // List of all float samples
+    std::list<DurationSample> samples_dur = c.getDurations(); // List of all duration samples
+    std::list<StringSample> samples_str = d.getStrings(); // List of all string samples
+    std::list<BigIntegerSample> samples_bigint = e.getBigIntegers(); // List of all big integer samples
+
+    uint32_t i = 2; // Index pointed to the end of array of samples
+    for (std::list<IntegerSample>::iterator it = samples_int.begin(); it != samples_int.end(); ++it) {
+        EXPECT_EQ(int_samples[i], static_cast<int64_t>((*it).first));
+        --i;
+    }
+    i = 2;
+    for (std::list<FloatSample>::iterator it = samples_float.begin(); it != samples_float.end(); ++it) {
+        EXPECT_EQ(float_samples[i], (*it).first);
+        --i;
+    }
+    i = 2;
+    for (std::list<DurationSample>::iterator it = samples_dur.begin(); it != samples_dur.end(); ++it) {
+        EXPECT_EQ(duration_samples[i], (*it).first);
+        --i;
+    }
+    i = 2;
+    for (std::list<StringSample>::iterator it = samples_str.begin(); it != samples_str.end(); ++it) {
+        EXPECT_EQ(string_samples[i], (*it).first);
+        --i;
+    }
+    i = 2;
+    for (BigIntegerSample const& sample : samples_bigint) {
+        EXPECT_EQ(bigint_samples[i], sample.first);
+        --i;
+    }
+}
+
+// This test checks whether the size of storage
+// is equal to the true value
+TEST_F(ObservationTest, getSize) {
+    // Check if size of storages is equal to 1
+    ASSERT_EQ(a.getSize(), 1);
+    ASSERT_EQ(b.getSize(), 1);
+    ASSERT_EQ(c.getSize(), 1);
+    ASSERT_EQ(d.getSize(), 1);
+    ASSERT_EQ(e.getSize(), 1);
+
+    a.addValue(static_cast<int64_t>(5678));
+    b.addValue(56.78);
+    c.addValue(dur5678);
+    d.addValue("fiveSixSevenEight");
+    e.addValue(int128_t(43e21));
+
+    EXPECT_NO_THROW(a.getSize());
+    EXPECT_NO_THROW(b.getSize());
+    EXPECT_NO_THROW(c.getSize());
+    EXPECT_NO_THROW(d.getSize());
+    EXPECT_NO_THROW(e.getSize());
+
+    // Check if size of storages is equal to 2
+    ASSERT_EQ(a.getSize(), 2);
+    ASSERT_EQ(b.getSize(), 2);
+    ASSERT_EQ(c.getSize(), 2);
+    ASSERT_EQ(d.getSize(), 2);
+    ASSERT_EQ(e.getSize(), 2);
+
+    a.setValue(static_cast<int64_t>(5678));
+    b.setValue(56e+78);
+    c.setValue(dur5678);
+    d.setValue("fiveSixSevenEight");
+    e.setValue(int128_t(43e21));
+
+    EXPECT_NO_THROW(a.getSize());
+    EXPECT_NO_THROW(b.getSize());
+    EXPECT_NO_THROW(c.getSize());
+    EXPECT_NO_THROW(d.getSize());
+
+    // Check if size of storages is equal to 3
+    ASSERT_EQ(a.getSize(), 3);
+    ASSERT_EQ(b.getSize(), 3);
+    ASSERT_EQ(c.getSize(), 3);
+    ASSERT_EQ(d.getSize(), 3);
+    ASSERT_EQ(e.getSize(), 3);
+}
+
+// Checks whether setting amount limits works properly
+TEST_F(ObservationTest, setCountLimit) {
+    // Preparing of 21 test's samples for each type of storage
+    int64_t int_samples[22] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13,
+            14, 15, 16, 17, 18, 19, 20, 21};
+    double float_samples[22] = {0.0, 1.0, 2.0, 3.0, 4.0, 5.0, 6.0, 7.0, 8.0,
+            9.0, 10.0, 11.0, 12.0, 13.0, 14.0, 15.0, 16.0, 17.0, 18.0, 19.0,
+            20.0, 21.0};
+    std::string string_samples[22] = {"a", "b", "c", "d", "e", "f", "g", "h",
+            "i", "j", "k", "l", "m", "n", "o", "p", "q", "r", "s", "t", "u",
+            "v"};
+    StatsDuration duration_samples[22];
+
+    for (uint32_t i = 0; i < 22; ++i) {
+        duration_samples[i] = milliseconds(i);
+    }
+
+    // By default the max_sample_count is set to 20 and max_sample_age
+    // is deactivated
+    // Adding 21 samples to each type of Observation
+    for (uint32_t i = 0; i < 21; ++i) {
+        a.setValue(int_samples[i]);
+    }
+    for (uint32_t i = 0; i < 21; ++i) {
+        b.setValue(float_samples[i]);
+    }
+    for (uint32_t i = 0; i < 21; ++i) {
+        c.setValue(duration_samples[i]);
+    }
+    for (uint32_t i = 0; i < 21; ++i) {
+        d.setValue(string_samples[i]);
+    }
+    for (uint32_t i = 0; i < 21; ++i) {
+        e.setValue(int128_t(int_samples[i]));
+    }
+
+    // Getting all 4 types of samples after inserting 21 values
+    std::list<IntegerSample> samples_int = a.getIntegers();
+    std::list<FloatSample> samples_float = b.getFloats();
+    std::list<DurationSample> samples_duration = c.getDurations();
+    std::list<StringSample> samples_string = d.getStrings();
+    std::list<BigIntegerSample> samples_bigint = e.getBigIntegers();
+
+    // Check if size of storages is equal to 20
+    ASSERT_EQ(a.getSize(), 20);
+    ASSERT_EQ(b.getSize(), 20);
+    ASSERT_EQ(c.getSize(), 20);
+    ASSERT_EQ(d.getSize(), 20);
+    ASSERT_EQ(e.getSize(), 20);
+
+    // And whether stored values are correct
+    uint32_t i = 20; // index of the last element in array of test's samples
+    for (std::list<IntegerSample>::iterator it = samples_int.begin(); it != samples_int.end(); ++it) {
+        EXPECT_EQ((*it).first, int_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<FloatSample>::iterator it = samples_float.begin(); it != samples_float.end(); ++it) {
+        EXPECT_EQ((*it).first, float_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<DurationSample>::iterator it = samples_duration.begin(); it != samples_duration.end(); ++it) {
+        EXPECT_EQ((*it).first, duration_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<StringSample>::iterator it = samples_string.begin(); it != samples_string.end(); ++it) {
+        EXPECT_EQ((*it).first, string_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (BigIntegerSample const& sample : samples_bigint) {
+        EXPECT_EQ(sample.first, int_samples[i]);
+        --i;
+    }
+
+    // Change size of storage to smaller one
+    ASSERT_NO_THROW(a.setMaxSampleCount(10));
+    ASSERT_NO_THROW(b.setMaxSampleCount(10));
+    ASSERT_NO_THROW(c.setMaxSampleCount(10));
+    ASSERT_NO_THROW(d.setMaxSampleCount(10));
+    ASSERT_NO_THROW(e.setMaxSampleCount(10));
+
+    samples_int = a.getIntegers();
+    samples_float = b.getFloats();
+    samples_duration = c.getDurations();
+    samples_string = d.getStrings();
+    samples_bigint = e.getBigIntegers();
+
+    // Check if size of storages is equal to 10
+    ASSERT_EQ(a.getSize(), 10);
+    ASSERT_EQ(b.getSize(), 10);
+    ASSERT_EQ(c.getSize(), 10);
+    ASSERT_EQ(d.getSize(), 10);
+    ASSERT_EQ(e.getSize(), 10);
+
+    // And whether storages contain only the 10 newest values
+    i = 20; // index of last element in array of test's samples
+    for (std::list<IntegerSample>::iterator it = samples_int.begin(); it != samples_int.end(); ++it) {
+        EXPECT_EQ((*it).first, int_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<FloatSample>::iterator it = samples_float.begin(); it != samples_float.end(); ++it) {
+        EXPECT_EQ((*it).first, float_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<DurationSample>::iterator it = samples_duration.begin(); it != samples_duration.end(); ++it) {
+        EXPECT_EQ((*it).first, duration_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (std::list<StringSample>::iterator it = samples_string.begin(); it != samples_string.end(); ++it) {
+        EXPECT_EQ((*it).first, string_samples[i]);
+        --i;
+    }
+    i = 20; // index of last element in array of test's samples
+    for (BigIntegerSample const& sample : samples_bigint) {
+        EXPECT_EQ(sample.first, int_samples[i]);
+        --i;
+    }
+
+    // Resize max_sample_count to greater
+    ASSERT_NO_THROW(a.setMaxSampleCount(50));
+    ASSERT_NO_THROW(b.setMaxSampleCount(50));
+    ASSERT_NO_THROW(c.setMaxSampleCount(50));
+    ASSERT_NO_THROW(d.setMaxSampleCount(50));
+    ASSERT_NO_THROW(e.setMaxSampleCount(50));
+
+    // Check if size of storages did not change without adding new value
+    ASSERT_EQ(a.getSize(), 10);
+    ASSERT_EQ(b.getSize(), 10);
+    ASSERT_EQ(c.getSize(), 10);
+    ASSERT_EQ(d.getSize(), 10);
+    ASSERT_EQ(e.getSize(), 10);
+
+    // Add new values to each type of Observation
+    a.setValue(static_cast<int64_t>(21));
+    b.setValue(21.0);
+    c.setValue(milliseconds(21));
+    d.setValue("v");
+    e.setValue(int128_t(21));
+
+    samples_int = a.getIntegers();
+    samples_float = b.getFloats();
+    samples_duration = c.getDurations();
+    samples_string = d.getStrings();
+    samples_bigint = e.getBigIntegers();
+
+    ASSERT_EQ(a.getSize(), 11);
+    ASSERT_EQ(b.getSize(), 11);
+    ASSERT_EQ(c.getSize(), 11);
+    ASSERT_EQ(d.getSize(), 11);
+    ASSERT_EQ(e.getSize(), 11);
+
+    i = 21; // index of last element in array of test's samples
+    for (std::list<IntegerSample>::iterator it = samples_int.begin(); it != samples_int.end(); ++it) {
+        EXPECT_EQ((*it).first, int_samples[i]);
+        --i;
+    }
+    i = 21; // index of last element in array of test's samples
+    for (std::list<FloatSample>::iterator it = samples_float.begin(); it != samples_float.end(); ++it) {
+        EXPECT_EQ((*it).first, float_samples[i]);
+        --i;
+    }
+    i = 21; // index of last element in array of test's samples
+    for (std::list<DurationSample>::iterator it = samples_duration.begin(); it != samples_duration.end(); ++it) {
+        EXPECT_EQ((*it).first, duration_samples[i]);
+        --i;
+    }
+    i = 21; // index of last element in array of test's samples
+    for (std::list<StringSample>::iterator it = samples_string.begin(); it != samples_string.end(); ++it) {
+        EXPECT_EQ((*it).first, string_samples[i]);
+        --i;
+    }
+    i = 21; // index of last element in array of test's samples
+    for (BigIntegerSample const& sample : samples_bigint) {
+        EXPECT_EQ(sample.first, int_samples[i]);
+        --i;
+    }
+}
+
+// Checks whether setting age limits works properly
+TEST_F(ObservationTest, setAgeLimit) {
+    // Set max_sample_age to 1 second
+    ASSERT_NO_THROW(c.setMaxSampleAge(seconds(1)));
+    // Add some value
+    c.setValue(milliseconds(5));
+    // Wait 1 second
+    sleep(1);
+    // and add new value
+    c.setValue(milliseconds(3));
+
+    // get the list of all samples
+    std::list<DurationSample> samples_duration = c.getDurations();
+    // check whether the size of samples is equal to 1
+    ASSERT_EQ(c.getSize(), 1);
+    // and whether it contains an expected value
+    EXPECT_EQ((*samples_duration.begin()).first, milliseconds(3));
+
+    // Wait 1 second to ensure removing previously set value
+    sleep(1);
+    // add 10 new values
+    for (uint32_t i = 0; i < 10; ++i) {
+        c.setValue(milliseconds(i));
+    }
+    // change the max_sample_age to smaller
+    ASSERT_NO_THROW(c.setMaxSampleAge(milliseconds(300)));
+
+    samples_duration = c.getDurations();
+    // check whether the size of samples is equal to 10
+    ASSERT_EQ(c.getSize(), 10);
+
+    // and whether it contains expected values
+    uint32_t i = 9;
+    for (std::list<DurationSample>::iterator it = samples_duration.begin(); it != samples_duration.end(); ++it) {
+        EXPECT_EQ((*it).first, milliseconds(i));
+        --i;
+    }
+}
+
+// Test checks whether we can get max_sample_age_ and max_sample_count_
+// properly.
+TEST_F(ObservationTest, getLimits) {
+    // First checks whether getting default values works properly
+    EXPECT_EQ(a.getMaxSampleAge().first, false);
+    EXPECT_EQ(b.getMaxSampleAge().first, false);
+    EXPECT_EQ(c.getMaxSampleAge().first, false);
+    EXPECT_EQ(d.getMaxSampleAge().first, false);
+    EXPECT_EQ(e.getMaxSampleAge().first, false);
+
+    EXPECT_EQ(a.getMaxSampleCount().first, true);
+    EXPECT_EQ(b.getMaxSampleCount().first, true);
+    EXPECT_EQ(c.getMaxSampleCount().first, true);
+    EXPECT_EQ(d.getMaxSampleCount().first, true);
+    EXPECT_EQ(e.getMaxSampleCount().first, true);
+
+    EXPECT_EQ(a.getMaxSampleCount().second, 20);
+    EXPECT_EQ(b.getMaxSampleCount().second, 20);
+    EXPECT_EQ(c.getMaxSampleCount().second, 20);
+    EXPECT_EQ(d.getMaxSampleCount().second, 20);
+    EXPECT_EQ(e.getMaxSampleCount().second, 20);
+
+    // change limit to time duration
+    ASSERT_NO_THROW(a.setMaxSampleAge(dur453));
+    ASSERT_NO_THROW(b.setMaxSampleAge(dur453));
+    ASSERT_NO_THROW(c.setMaxSampleAge(dur453));
+    ASSERT_NO_THROW(d.setMaxSampleAge(dur453));
+    ASSERT_NO_THROW(e.setMaxSampleAge(dur453));
+
+    EXPECT_EQ(a.getMaxSampleAge().first, true);
+    EXPECT_EQ(b.getMaxSampleAge().first, true);
+    EXPECT_EQ(c.getMaxSampleAge().first, true);
+    EXPECT_EQ(d.getMaxSampleAge().first, true);
+    EXPECT_EQ(e.getMaxSampleAge().first, true);
+
+    EXPECT_EQ(a.getMaxSampleAge().second, dur453);
+    EXPECT_EQ(b.getMaxSampleAge().second, dur453);
+    EXPECT_EQ(c.getMaxSampleAge().second, dur453);
+    EXPECT_EQ(d.getMaxSampleAge().second, dur453);
+    EXPECT_EQ(e.getMaxSampleAge().second, dur453);
+
+    EXPECT_EQ(a.getMaxSampleCount().first, false);
+    EXPECT_EQ(b.getMaxSampleCount().first, false);
+    EXPECT_EQ(c.getMaxSampleCount().first, false);
+    EXPECT_EQ(d.getMaxSampleCount().first, false);
+    EXPECT_EQ(e.getMaxSampleCount().first, false);
+
+    EXPECT_EQ(a.getMaxSampleCount().second, 20);
+    EXPECT_EQ(b.getMaxSampleCount().second, 20);
+    EXPECT_EQ(c.getMaxSampleCount().second, 20);
+    EXPECT_EQ(d.getMaxSampleCount().second, 20);
+    EXPECT_EQ(e.getMaxSampleCount().second, 20);
+}
+
+// limit defaults are tested with StatsMgr.
+
+// Test checks whether timing is reported properly.
+TEST_F(ObservationTest, timers) {
+    auto before = SampleClock::now();
+    b.setValue(123.0); // Set it to a random value and record the time.
+
+    // Allow a bit of imprecision. This test allows 500ms. That should be ok,
+    // when running on virtual machines.
+    auto after = before + milliseconds(500);
+
+    // Now wait some time. We want to confirm that the timestamp recorded is the
+    // time the observation took place, not current time.
+    sleep(1);
+
+    FloatSample sample = b.getFloat();
+
+    // Let's check that the timestamp is within (before, after) range:
+    // before < sample-time < after
+    EXPECT_TRUE(before <= sample.second);
+    EXPECT_TRUE(sample.second <= after);
+}
+
+// Checks whether an integer statistic can generate proper JSON structures.
+// See https://gitlab.isc.org/isc-projects/kea/wikis/designs/Stats-design
+/// for details.
+TEST_F(ObservationTest, integerToJSON) {
+    // String which contains first added sample
+    std::string first_sample = ", [ 1234, \"" +
+        isc::util::clockToText(a.getInteger().second) + "\" ] ]";
+
+    a.setValue(static_cast<int64_t>(1234));
+
+    std::string exp = "[ [ 1234, \"" +
+        isc::util::clockToText(a.getInteger().second) + "\" ]" + first_sample;
+
+    EXPECT_EQ(exp, a.getJSON()->str());
+}
+
+// Checks whether a floating point statistic can generate proper JSON
+// structures. See
+/// https://gitlab.isc.org/isc-projects/kea/wikis/designs/Stats-design
+/// for details.
+TEST_F(ObservationTest, floatToJSON) {
+    // String which contains first added sample
+    std::string first_sample = ", [ 12.34, \"" +
+        isc::util::clockToText(b.getFloat().second) + "\" ] ]";
+
+    // Let's use a value that converts easily to floating point.
+    // No need to deal with infinite fractions in binary systems.
+
+    b.setValue(1234.5);
+
+    std::string exp = "[ [ 1234.5, \"" +
+        isc::util::clockToText(b.getFloat().second) + "\" ]" + first_sample;
+
+    EXPECT_EQ(exp, b.getJSON()->str());
+}
+
+// Checks whether a time duration statistic can generate proper JSON structures.
+// See https://gitlab.isc.org/isc-projects/kea/wikis/designs/Stats-design for
+// details.
+TEST_F(ObservationTest, durationToJSON) {
+    // String which contains first added sample
+    std::string first_sample = ", [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(c.getDuration().second) + "\" ] ]";
+
+    // 1 hour 2 minutes 3 seconds and 4 milliseconds
+    c.setValue(dur1234);
+
+    std::string exp = "[ [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(c.getDuration().second) + "\" ]" + first_sample;
+
+    EXPECT_EQ(exp, c.getJSON()->str());
+}
+
+// Checks whether a string statistic can generate proper JSON structures.
+// See https://gitlab.isc.org/isc-projects/kea/wikis/designs/Stats-design
+// for details.
+TEST_F(ObservationTest, stringToJSON) {
+    // String which contains first added sample
+    std::string first_sample = ", [ \"1234\", \"" +
+        isc::util::clockToText(d.getString().second) + "\" ] ]";
+
+    d.setValue("Lorem ipsum dolor sit amet");
+
+    std::string exp = "[ [ \"Lorem ipsum dolor sit amet\", \"" +
+        isc::util::clockToText(d.getString().second) + "\" ]" + first_sample;
+
+    EXPECT_EQ(exp, d.getJSON()->str());
+}
+
+// Checks whether a big integer statistic can generate proper JSON structures.
+// See https://gitlab.isc.org/isc-projects/kea/wikis/designs/Stats-design
+// for details.
+TEST_F(ObservationTest, bigIntegerToJSON) {
+    // String which contains first added sample
+    std::string first_sample = ", [ 120000000000000007304085773727301632, \"" +
+        isc::util::clockToText(e.getBigInteger().second) + "\" ] ]";
+
+    e.setValue(int128_t(43e21));
+
+    std::string exp = "[ [ 43000000000000002097152, \"" +
+        isc::util::clockToText(e.getBigInteger().second) + "\" ]" + first_sample;
+
+    EXPECT_EQ(exp, e.getJSON()->str());
+}
+
+// Checks whether reset() resets the statistics properly.
+TEST_F(ObservationTest, reset) {
+    EXPECT_NO_THROW(a.addValue(static_cast<int64_t>(5678)));
+    EXPECT_NO_THROW(b.addValue(56.78));
+    EXPECT_NO_THROW(c.addValue(dur5678));
+    EXPECT_NO_THROW(d.addValue("fiveSixSevenEight"));
+    EXPECT_NO_THROW(e.addValue(int128_t(43e21)));
+
+    a.reset(); // integer
+    b.reset(); // float
+    c.reset(); // duration
+    d.reset(); // string
+    e.reset(); // big integer
+
+    EXPECT_EQ(0, a.getInteger().first);
+    EXPECT_EQ(0.0, b.getFloat().first);
+    EXPECT_EQ(StatsDuration::zero(), c.getDuration().first);
+    EXPECT_EQ("", d.getString().first);
+    EXPECT_EQ(0, e.getBigInteger().first);
+
+    ASSERT_EQ(a.getSize(), 1);
+    ASSERT_EQ(b.getSize(), 1);
+    ASSERT_EQ(c.getSize(), 1);
+    ASSERT_EQ(d.getSize(), 1);
+    ASSERT_EQ(e.getSize(), 1);
+}
+
+// Checks whether an observation can keep its name.
+TEST_F(ObservationTest, names) {
+    EXPECT_EQ("alpha", a.getName());
+    EXPECT_EQ("beta", b.getName());
+    EXPECT_EQ("gamma", c.getName());
+    EXPECT_EQ("delta", d.getName());
+    EXPECT_EQ("epsilon", e.getName());
+}
+
+}  // namespace
diff --git a/src/lib/stats/tests/run_unittests.cc b/src/lib/stats/tests/run_unittests.cc
new file mode 100644
index 0000000..9d621ae
--- /dev/null
+++ b/src/lib/stats/tests/run_unittests.cc
@@ -0,0 +1,18 @@
+// Copyright (C) 2015 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <gtest/gtest.h>
+
+int
+main(int argc, char* argv[]) {
+    ::testing::InitGoogleTest(&argc, argv);
+
+    int result = RUN_ALL_TESTS();
+
+    return (result);
+}
diff --git a/src/lib/stats/tests/stats_mgr_unittest.cc b/src/lib/stats/tests/stats_mgr_unittest.cc
new file mode 100644
index 0000000..734d134
--- /dev/null
+++ b/src/lib/stats/tests/stats_mgr_unittest.cc
@@ -0,0 +1,1117 @@
+// Copyright (C) 2015-2020 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#include <config.h>
+
+#include <stats/stats_mgr.h>
+#include <exceptions/exceptions.h>
+#include <cc/data.h>
+#include <cc/command_interpreter.h>
+#include <util/chrono_time_utils.h>
+#include <boost/shared_ptr.hpp>
+#include <gtest/gtest.h>
+
+#include <iostream>
+#include <sstream>
+
+using namespace isc;
+using namespace isc::data;
+using namespace isc::stats;
+using namespace isc::config;
+using namespace std::chrono;
+
+namespace {
+
+static const StatsDuration& dur1234(hours(1) + minutes(2) + seconds(3) +
+                                    milliseconds(4));
+static const StatsDuration& dur5678(hours(5) + minutes(6) + seconds(7) +
+                                    milliseconds(8));
+static const StatsDuration& dur1245(hours(1) + minutes(2) + seconds(45));
+
+/// @brief Fixture class for StatsMgr testing
+///
+/// Very simple class that makes sure that StatsMgr is indeed instantiated
+/// before the test and any statistics are wiped out after it.
+class StatsMgrTest : public ::testing::Test {
+public:
+    /// @brief Constructor
+    /// Makes sure that the Statistics Manager is instantiated.
+    StatsMgrTest() {
+        StatsMgr::instance();
+        StatsMgr::instance().removeAll();
+    }
+
+    /// @brief Destructor
+    /// Removes all statistics and restores class defaults.
+    ~StatsMgrTest() {
+        StatsMgr::instance().removeAll();
+        StatsMgr::instance().setMaxSampleAgeDefault(StatsDuration::zero());
+        StatsMgr::instance().setMaxSampleCountDefault(20);
+    }
+};
+
+// Basic test for statistics manager interface.
+TEST_F(StatsMgrTest, basic) {
+    // Getting an instance
+    EXPECT_NO_THROW(StatsMgr::instance());
+
+    // Check that there are no statistics recorded by default.
+    EXPECT_EQ(0, StatsMgr::instance().count());
+}
+
+// Test checks whether it's possible to record and later report
+// an integer statistic.
+TEST_F(StatsMgrTest, integerStat) {
+    EXPECT_NO_THROW(StatsMgr::instance().setValue("alpha",
+                                                  static_cast<int64_t>(1234)));
+
+    ObservationPtr alpha;
+    EXPECT_NO_THROW(alpha = StatsMgr::instance().getObservation("alpha"));
+    ASSERT_TRUE(alpha);
+
+    std::string exp = "{ \"alpha\": [ [ 1234, \"" +
+        isc::util::clockToText(alpha->getInteger().second) + "\" ] ] }";
+
+    EXPECT_EQ(exp, StatsMgr::instance().get("alpha")->str());
+}
+
+// Test checks whether it's possible to record and later report
+// a floating point statistic.
+TEST_F(StatsMgrTest, floatStat) {
+    EXPECT_NO_THROW(StatsMgr::instance().setValue("beta", 12.34));
+
+    ObservationPtr beta;
+    EXPECT_NO_THROW(beta = StatsMgr::instance().getObservation("beta"));
+    ASSERT_TRUE(beta);
+
+    std::string exp = "{ \"beta\": [ [ 12.34, \"" +
+        isc::util::clockToText(beta->getFloat().second) + "\" ] ] }";
+
+    EXPECT_EQ(exp, StatsMgr::instance().get("beta")->str());
+}
+
+// Test checks whether it's possible to record and later report
+// a duration statistic.
+TEST_F(StatsMgrTest, durationStat) {
+    EXPECT_NO_THROW(StatsMgr::instance().setValue("gamma", dur1234));
+
+    ObservationPtr gamma;
+    EXPECT_NO_THROW(gamma = StatsMgr::instance().getObservation("gamma"));
+    ASSERT_TRUE(gamma);
+
+    std::string exp = "{ \"gamma\": [ [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(gamma->getDuration().second) + "\" ] ] }";
+
+    EXPECT_EQ(exp, StatsMgr::instance().get("gamma")->str());
+}
+
+// Test checks whether it's possible to record and later report
+// a string statistic.
+TEST_F(StatsMgrTest, stringStat) {
+    EXPECT_NO_THROW(StatsMgr::instance().setValue("delta",
+                                                  "Lorem ipsum"));
+
+    ObservationPtr delta;
+    EXPECT_NO_THROW(delta = StatsMgr::instance().getObservation("delta"));
+    ASSERT_TRUE(delta);
+
+    std::string exp = "{ \"delta\": [ [ \"Lorem ipsum\", \"" +
+        isc::util::clockToText(delta->getString().second) + "\" ] ] }";
+
+    EXPECT_EQ(exp, StatsMgr::instance().get("delta")->str());
+}
+
+// Basic test of getSize function.
+TEST_F(StatsMgrTest, getSize) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    EXPECT_NO_THROW(StatsMgr::instance().getSize("alpha"));
+    EXPECT_NO_THROW(StatsMgr::instance().getSize("beta"));
+    EXPECT_NO_THROW(StatsMgr::instance().getSize("gamma"));
+    EXPECT_NO_THROW(StatsMgr::instance().getSize("delta"));
+
+    EXPECT_EQ(StatsMgr::instance().getSize("alpha"), 1);
+    EXPECT_EQ(StatsMgr::instance().getSize("beta"), 1);
+    EXPECT_EQ(StatsMgr::instance().getSize("gamma"), 1);
+    EXPECT_EQ(StatsMgr::instance().getSize("delta"), 1);
+}
+
+// Test checks whether setting age limit and count limit works properly.
+TEST_F(StatsMgrTest, setLimits) {
+    // Initializing of an integer type observation
+    StatsMgr::instance().setValue("foo", static_cast<int64_t>(1));
+
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleAge("foo",
+                                                         seconds(1)));
+
+    for (uint32_t i = 0; i < 10; ++i) {
+        if (i == 5) {
+            sleep(1); // wait one second to force exceeding the time limit
+        }
+        StatsMgr::instance().setValue("foo", static_cast<int64_t>(i));
+    }
+
+    EXPECT_EQ(StatsMgr::instance().getSize("foo"), 5);
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleCount("foo", 100));
+
+    for (int64_t i = 0; i < 200; ++i) {
+        StatsMgr::instance().setValue("foo", i);
+    }
+
+    EXPECT_EQ(StatsMgr::instance().getSize("foo"), 100);
+}
+
+// Test checks whether setting age limit and count limit to existing
+// statistics works properly.
+TEST_F(StatsMgrTest, setLimitsAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // check the setting of time limit to existing statistics
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleAgeAll(seconds(1)));
+
+    // check if time limit was set properly and whether count limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second,
+              seconds(1));
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second,
+              seconds(1));
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second,
+              seconds(1));
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second,
+              seconds(1));
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, false);
+
+    // check the setting of count limit to existing statistics
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleCountAll(1200));
+
+    // check if count limit was set properly and whether count limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 1200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 1200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 1200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 1200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+}
+
+// Test checks whether setting default age limit and count limit works
+// properly.
+TEST_F(StatsMgrTest, setLimitsDefault) {
+    ASSERT_EQ(StatsMgr::instance().getMaxSampleCountDefault(), 20);
+    ASSERT_EQ(StatsMgr::instance().getMaxSampleAgeDefault(), StatsDuration::zero());
+
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", seconds(1234));
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // check what default applied
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second, StatsDuration::zero());
+
+    // Retry with another default count limits.
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleCountDefault(10));
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleAgeDefault(seconds(5)));
+    ASSERT_EQ(StatsMgr::instance().getMaxSampleCountDefault(), 10);
+    ASSERT_EQ(StatsMgr::instance().getMaxSampleAgeDefault(), seconds(5));
+
+    // Check the existing statistics were not updated.
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second, StatsDuration::zero());
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 20);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second, StatsDuration::zero());
+
+    // Remove all test statistics.
+    EXPECT_NO_THROW(StatsMgr::instance().removeAll());
+
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", seconds(1234));
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second, seconds(5));
+
+    // Retry with count limit disable.
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleCountDefault(0));
+    ASSERT_EQ(StatsMgr::instance().getMaxSampleCountDefault(), 0);
+
+    // Check the existing statistics were not updated.
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second, seconds(5));
+
+    // Remove all test statistics.
+    EXPECT_NO_THROW(StatsMgr::instance().removeAll());
+
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", seconds(1234));
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second, seconds(5));
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, false);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 10);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second, seconds(5));
+
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleCountDefault(20));
+    EXPECT_NO_THROW(StatsMgr::instance().setMaxSampleAgeDefault(StatsDuration::zero()));
+}
+
+// This test checks whether a single (get("foo")) and all (getAll())
+// statistics are reported properly.
+TEST_F(StatsMgrTest, getGetAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem");
+
+    // The string's representation of firstly added statistics
+    std::string alpha_first = ", [ 1234, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("alpha")
+                                   ->getInteger().second) + "\" ] ]";
+    std::string beta_first = ", [ 12.34, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("beta")
+                                   ->getFloat().second) + "\" ] ]";
+    std::string gamma_first = ", [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("gamma")
+                                   ->getDuration().second) + "\" ] ]";
+    std::string delta_first = ", [ \"Lorem\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("delta")
+                                   ->getString().second) + "\" ] ]";
+
+    // Now add some values to them
+    StatsMgr::instance().addValue("alpha", static_cast<int64_t>(5678));
+    StatsMgr::instance().addValue("beta", 56.78);
+    StatsMgr::instance().addValue("gamma", dur5678);
+    StatsMgr::instance().addValue("delta", " ipsum");
+
+    // There should be 4 statistics reported
+    EXPECT_EQ(4, StatsMgr::instance().count());
+
+    // Now check whether they can be reported back
+    ConstElementPtr rep_alpha = StatsMgr::instance().get("alpha");
+    ConstElementPtr rep_beta = StatsMgr::instance().get("beta");
+    ConstElementPtr rep_gamma = StatsMgr::instance().get("gamma");
+    ConstElementPtr rep_delta = StatsMgr::instance().get("delta");
+
+    ASSERT_TRUE(rep_alpha);
+    ASSERT_TRUE(rep_beta);
+    ASSERT_TRUE(rep_gamma);
+    ASSERT_TRUE(rep_delta);
+
+    std::string exp_str_alpha = "[ [ 6912, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("alpha")
+                                   ->getInteger().second) + "\" ]" + alpha_first;
+    std::string exp_str_beta = "[ [ 69.12, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("beta")
+                                   ->getFloat().second) + "\" ]" + beta_first;
+    std::string exp_str_gamma = "[ [ \"06:08:10.012000\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("gamma")
+                                   ->getDuration().second) + "\" ]" + gamma_first;
+    std::string exp_str_delta = "[ [ \"Lorem ipsum\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("delta")
+                                   ->getString().second) + "\" ]" + delta_first;
+
+    // Check that individual stats are reported properly
+    EXPECT_EQ("{ \"alpha\": " + exp_str_alpha + " }", rep_alpha->str());
+    EXPECT_EQ("{ \"beta\": " + exp_str_beta + " }", rep_beta->str());
+    EXPECT_EQ("{ \"gamma\": " + exp_str_gamma + " }", rep_gamma->str());
+    EXPECT_EQ("{ \"delta\": " + exp_str_delta + " }", rep_delta->str());
+
+    // Check that non-existent metric is not reported.
+    EXPECT_EQ("{  }", StatsMgr::instance().get("epsilon")->str());
+
+    // Check that all of them can be reported at once
+    ConstElementPtr rep_all = StatsMgr::instance().getAll();
+    ASSERT_TRUE(rep_all);
+
+    // Verifying this is a bit more involved, as we don't know whether the
+    // order would be preserved or not.
+    EXPECT_EQ(4, rep_all->size());
+    ASSERT_TRUE(rep_all->get("alpha"));
+    ASSERT_TRUE(rep_all->get("beta"));
+    ASSERT_TRUE(rep_all->get("delta"));
+    ASSERT_TRUE(rep_all->get("gamma"));
+    EXPECT_FALSE(rep_all->get("epsilon"));
+
+    EXPECT_EQ(exp_str_alpha, rep_all->get("alpha")->str());
+    EXPECT_EQ(exp_str_beta, rep_all->get("beta")->str());
+    EXPECT_EQ(exp_str_gamma, rep_all->get("gamma")->str());
+    EXPECT_EQ(exp_str_delta, rep_all->get("delta")->str());
+}
+
+// This test checks whether existing statistics can be reset.
+TEST_F(StatsMgrTest, reset) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // This should reset alpha to 0
+    EXPECT_NO_THROW(StatsMgr::instance().reset("alpha"));
+    EXPECT_EQ(0,
+              StatsMgr::instance().getObservation("alpha")->getInteger().first);
+
+    // The other stats should remain untouched
+    EXPECT_EQ(12.34,
+              StatsMgr::instance().getObservation("beta")->getFloat().first);
+    EXPECT_EQ(dur1234,
+              StatsMgr::instance().getObservation("gamma")->getDuration().first);
+    EXPECT_EQ("Lorem ipsum",
+              StatsMgr::instance().getObservation("delta")->getString().first);
+
+    // Now let's wipe them, too.
+    EXPECT_NO_THROW(StatsMgr::instance().reset("beta"));
+    EXPECT_NO_THROW(StatsMgr::instance().reset("gamma"));
+    EXPECT_NO_THROW(StatsMgr::instance().reset("delta"));
+    EXPECT_EQ(0.0,
+              StatsMgr::instance().getObservation("beta")->getFloat().first);
+    EXPECT_EQ(StatsDuration::zero(),
+              StatsMgr::instance().getObservation("gamma")->getDuration().first);
+    EXPECT_EQ("",
+              StatsMgr::instance().getObservation("delta")->getString().first);
+
+    // Resetting statistics should not remove them
+    EXPECT_EQ(4, StatsMgr::instance().count());
+}
+
+// This test checks whether existing statistics can be reset.
+TEST_F(StatsMgrTest, resetAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // This should reset alpha to 0
+    EXPECT_NO_THROW(StatsMgr::instance().resetAll());
+    EXPECT_EQ(0,
+              StatsMgr::instance().getObservation("alpha")->getInteger().first);
+    EXPECT_EQ(0.0,
+              StatsMgr::instance().getObservation("beta")->getFloat().first);
+    EXPECT_EQ(StatsDuration::zero(),
+              StatsMgr::instance().getObservation("gamma")->getDuration().first);
+    EXPECT_EQ("",
+              StatsMgr::instance().getObservation("delta")->getString().first);
+
+    // Resetting all statistics should not remove them
+    EXPECT_EQ(4, StatsMgr::instance().count());
+}
+
+// This test checks whether statistics can be removed.
+TEST_F(StatsMgrTest, removeAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // This should reset alpha to 0
+    EXPECT_NO_THROW(StatsMgr::instance().removeAll());
+
+    // Resetting all statistics should not remove them
+    EXPECT_EQ(0, StatsMgr::instance().count());
+
+    // There should be no such statistics anymore
+    EXPECT_EQ("{  }", StatsMgr::instance().get("alpha")->str());
+    EXPECT_EQ("{  }", StatsMgr::instance().get("beta")->str());
+    EXPECT_EQ("{  }", StatsMgr::instance().get("gamma")->str());
+    EXPECT_EQ("{  }", StatsMgr::instance().get("delta")->str());
+
+    // There should be no such statistics anymore
+    EXPECT_FALSE(StatsMgr::instance().getObservation("alpha"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("beta"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("gamma"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("delta"));
+}
+
+// This is a performance benchmark that checks how long does it take
+// to increment a single statistic million times.
+//
+// Data points:
+// It took 00:00:00.363709 (363ms) on late 2013 Mac with Mac OS X 10.9.5.
+TEST_F(StatsMgrTest, DISABLED_performanceSingleAdd) {
+    StatsMgr::instance().removeAll();
+
+    uint32_t cycles = 1000000;
+
+    auto before = SampleClock::now();
+    for (uint32_t i = 0; i < cycles; ++i) {
+        StatsMgr::instance().addValue("metric1", 0.1 * i);
+    }
+    auto after = SampleClock::now();
+
+    auto dur = after - before;
+
+    std::cout << "Incrementing a single statistic " << cycles << " times took: "
+              << isc::util::durationToText(dur) << std::endl;
+}
+
+// This is a performance benchmark that checks how long does it take
+// to set absolute value of a single statistic million times.
+//
+// Data points:
+// It took 00:00:00.361003 (361ms) on late 2013 Mac with Mac OS X 10.9.5.
+TEST_F(StatsMgrTest, DISABLED_performanceSingleSet) {
+    StatsMgr::instance().removeAll();
+
+    uint32_t cycles = 1000000;
+
+    auto before = SampleClock::now();
+    for (uint32_t i = 0; i < cycles; ++i) {
+        StatsMgr::instance().setValue("metric1", 0.1 * i);
+    }
+    auto after = SampleClock::now();
+
+    auto dur = after - before;
+
+    std::cout << "Setting a single statistic " << cycles << " times took: "
+              << isc::util::durationToText(dur) << std::endl;
+}
+
+// This is a performance benchmark that checks how long does it take to
+// increment one statistic a million times, when there is 1000 other statistics
+// present.
+//
+// Data points:
+// 00:00:00.436943 (436ms) on late 2013 Mac with Mac OS X 10.9.5
+TEST_F(StatsMgrTest, DISABLED_performanceMultipleAdd) {
+    StatsMgr::instance().removeAll();
+
+    uint32_t cycles = 1000000;
+    uint32_t stats = 1000;
+
+    for (uint32_t i = 0; i < stats; ++i) {
+        std::stringstream tmp;
+        tmp << "statistic" << i;
+        StatsMgr::instance().setValue(tmp.str(), static_cast<int64_t>(i));
+    }
+
+    auto before = SampleClock::now();
+    for (uint32_t i = 0; i < cycles; ++i) {
+        StatsMgr::instance().addValue("metric1", static_cast<int64_t>(i));
+    }
+    auto after = SampleClock::now();
+
+    auto dur = after - before;
+
+    std::cout << "Incrementing one of " << stats << " statistics " << cycles
+              << " times took: " << isc::util::durationToText(dur) << std::endl;
+}
+
+// This is a performance benchmark that checks how long does it take to
+// set one statistic to a given value a million times, when there is 1000 other
+// statistics present.
+//
+// Data points:
+// 00:00:00.424518 (424ms) on late 2013 Mac with Mac OS X 10.9.5
+TEST_F(StatsMgrTest, DISABLED_performanceMultipleSet) {
+    StatsMgr::instance().removeAll();
+
+    uint32_t cycles = 1000000;
+    uint32_t stats = 1000;
+
+    for (uint32_t i = 0; i < stats; ++i) {
+        std::stringstream tmp;
+        tmp << "statistic" << i;
+        StatsMgr::instance().setValue(tmp.str(), static_cast<int64_t>(i));
+    }
+
+    auto before = SampleClock::now();
+    for (uint32_t i = 0; i < cycles; ++i) {
+        StatsMgr::instance().setValue("metric1", static_cast<int64_t>(i));
+    }
+    auto after = SampleClock::now();
+
+    auto dur = after - before;
+
+    std::cout << "Setting one of " << stats << " statistics " << cycles
+              << " times took: " << isc::util::durationToText(dur) << std::endl;
+}
+
+// Test checks whether statistics name can be generated using various
+// indexes.
+TEST_F(StatsMgrTest, generateName) {
+    // generateName is a templated method, so in principle anything printable
+    // to stream can be used as index. However, in practice only integers
+    // and possibly strings will be used.
+
+    // Let's text integer as index.
+    EXPECT_EQ("subnet[123].pkt4-received",
+              StatsMgr::generateName("subnet", 123, "pkt4-received"));
+
+    // Lets' test string as index.
+    EXPECT_EQ("subnet[foo].pkt4-received",
+              StatsMgr::generateName("subnet", "foo", "pkt4-received"));
+}
+
+// Test checks if statistic-get handler is able to return specified statistic.
+TEST_F(StatsMgrTest, commandStatisticGet) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+
+    ConstElementPtr rsp = StatsMgr::instance().statisticGetHandler("statistic-get",
+                                                                   params);
+
+    ObservationPtr alpha;
+    EXPECT_NO_THROW(alpha = StatsMgr::instance().getObservation("alpha"));
+    ASSERT_TRUE(alpha);
+
+    std::string exp = "{ \"alpha\": [ [ 1234, \"" +
+        isc::util::clockToText(alpha->getInteger().second) + "\" ] ] }";
+
+    EXPECT_EQ("{ \"arguments\": " + exp + ", \"result\": 0 }", rsp->str());
+}
+
+// Test checks if statistic-get is able to handle:
+// - a request without parameters
+// - a request with missing statistic name
+// - a request for non-existing statistic.
+TEST_F(StatsMgrTest, commandStatisticGetNegative) {
+    // Case 1: a request without parameters
+    ConstElementPtr rsp = StatsMgr::instance().statisticGetHandler("statistic-get",
+                                                                   ElementPtr());
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 2: a request with missing statistic name
+    ElementPtr params = Element::createMap();
+    rsp = StatsMgr::instance().statisticGetHandler("statistic-get", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 3: a request for non-existing statistic
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticGetHandler("statistic-get", params);
+    EXPECT_EQ("{ \"arguments\": {  }, \"result\": 0 }", rsp->str());
+}
+
+// This test checks whether statistic-get-all command returns all statistics
+// correctly.
+TEST_F(StatsMgrTest, commandGetAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // Now get them. They're used to generate expected output
+    ConstElementPtr rep_alpha = StatsMgr::instance().get("alpha");
+    ConstElementPtr rep_beta = StatsMgr::instance().get("beta");
+    ConstElementPtr rep_gamma = StatsMgr::instance().get("gamma");
+    ConstElementPtr rep_delta = StatsMgr::instance().get("delta");
+
+    ASSERT_TRUE(rep_alpha);
+    ASSERT_TRUE(rep_beta);
+    ASSERT_TRUE(rep_gamma);
+    ASSERT_TRUE(rep_delta);
+
+    std::string exp_str_alpha = "[ [ 1234, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("alpha")
+                                   ->getInteger().second) + "\" ] ]";
+    std::string exp_str_beta = "[ [ 12.34, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("beta")
+                                   ->getFloat().second) + "\" ] ]";
+    std::string exp_str_gamma = "[ [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("gamma")
+                                   ->getDuration().second) + "\" ] ]";
+    std::string exp_str_delta = "[ [ \"Lorem ipsum\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("delta")
+                                   ->getString().second) + "\" ] ]";
+
+    // Check that all of them can be reported at once
+    ConstElementPtr rsp = StatsMgr::instance().statisticGetAllHandler(
+        "statistic-get-all", ElementPtr());
+    ASSERT_TRUE(rsp);
+    int status_code;
+    ConstElementPtr rep_all = parseAnswer(status_code, rsp);
+    ASSERT_EQ(0, status_code);
+    ASSERT_TRUE(rep_all);
+
+    // Verifying this is a bit more involved, as we don't know whether the
+    // order would be preserved or not.
+    EXPECT_EQ(4, rep_all->size());
+    ASSERT_TRUE(rep_all->get("alpha"));
+    ASSERT_TRUE(rep_all->get("beta"));
+    ASSERT_TRUE(rep_all->get("delta"));
+    ASSERT_TRUE(rep_all->get("gamma"));
+    EXPECT_FALSE(rep_all->get("epsilon"));
+
+    EXPECT_EQ(exp_str_alpha, rep_all->get("alpha")->str());
+    EXPECT_EQ(exp_str_beta, rep_all->get("beta")->str());
+    EXPECT_EQ(exp_str_gamma, rep_all->get("gamma")->str());
+    EXPECT_EQ(exp_str_delta, rep_all->get("delta")->str());
+}
+
+// Test checks if statistic-reset handler is able to reset specified statistic.
+TEST_F(StatsMgrTest, commandStatisticReset) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticResetHandler("statistic-reset", params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    ObservationPtr alpha;
+    EXPECT_NO_THROW(alpha = StatsMgr::instance().getObservation("alpha"));
+    ASSERT_TRUE(alpha);
+
+    // Check that it was indeed reset
+    EXPECT_EQ(0, alpha->getInteger().first);
+}
+
+// Test checks if statistic-reset is able to handle:
+// - a request without parameters
+// - a request with missing statistic name
+// - a request for non-existing statistic.
+TEST_F(StatsMgrTest, commandStatisticResetNegative) {
+    // Case 1: a request without parameters
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticResetHandler("statistic-reset", ElementPtr());
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 2: a request with missing statistic name
+    ElementPtr params = Element::createMap();
+    rsp = StatsMgr::instance().statisticResetHandler("statistic-reset", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 3: a request for non-existing statistic
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticResetHandler("statistic-reset", params);
+    EXPECT_EQ("{ \"result\": 1, \"text\": \"No 'alpha' statistic found\" }",
+              rsp->str());
+}
+
+// This test checks whether statistic-reset-all command really resets all
+// statistics correctly.
+TEST_F(StatsMgrTest, commandResetAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // Now get them. They're used to generate expected output
+    ConstElementPtr rep_alpha = StatsMgr::instance().get("alpha");
+    ConstElementPtr rep_beta = StatsMgr::instance().get("beta");
+    ConstElementPtr rep_gamma = StatsMgr::instance().get("gamma");
+    ConstElementPtr rep_delta = StatsMgr::instance().get("delta");
+
+    ASSERT_TRUE(rep_alpha);
+    ASSERT_TRUE(rep_beta);
+    ASSERT_TRUE(rep_gamma);
+    ASSERT_TRUE(rep_delta);
+
+    std::string exp_str_alpha = "[ [ 1234, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("alpha")
+                                   ->getInteger().second) + "\" ] ]";
+    std::string exp_str_beta = "[ [ 12.34, \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("beta")
+                                   ->getFloat().second) + "\" ] ]";
+    std::string exp_str_gamma = "[ [ \"01:02:03.004000\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("gamma")
+                                   ->getDuration().second) + "\" ] ]";
+    std::string exp_str_delta = "[ [ \"Lorem ipsum\", \"" +
+        isc::util::clockToText(StatsMgr::instance().getObservation("delta")
+                                   ->getString().second) + "\" ] ]";
+
+    // Check that all of them can be reset at once
+    ConstElementPtr rsp = StatsMgr::instance().statisticResetAllHandler(
+        "statistic-reset-all", ElementPtr());
+    ASSERT_TRUE(rsp);
+    int status_code;
+    ConstElementPtr rep_all = parseAnswer(status_code, rsp);
+    ASSERT_EQ(0, status_code);
+    ASSERT_TRUE(rep_all);
+
+    // Check that they're indeed reset
+    EXPECT_EQ(0,
+              StatsMgr::instance().getObservation("alpha")->getInteger().first);
+    EXPECT_EQ(0.0f,
+              StatsMgr::instance().getObservation("beta")->getFloat().first);
+    EXPECT_EQ(StatsDuration::zero(),
+              StatsMgr::instance().getObservation("gamma")->getDuration().first);
+    EXPECT_EQ("",
+              StatsMgr::instance().getObservation("delta")->getString().first);
+}
+
+// Test checks if statistic-remove handler is able to remove a statistic.
+TEST_F(StatsMgrTest, commandStatisticRemove) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticRemoveHandler("statistic-remove", params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    // It should be gone.
+    EXPECT_FALSE(StatsMgr::instance().getObservation("alpha"));
+    EXPECT_EQ(0, StatsMgr::instance().count());
+}
+
+// Test checks if statistic-remove is able to handle:
+// - a request without parameters
+// - a request with missing statistic name
+// - a request for non-existing statistic.
+TEST_F(StatsMgrTest, commandStatisticRemoveNegative) {
+    // Case 1: a request without parameters
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticRemoveHandler("statistic-remove", ElementPtr());
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 2: a request with missing statistic name
+    ElementPtr params = Element::createMap();
+    rsp = StatsMgr::instance().statisticRemoveHandler("statistic-remove", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 3: a request for non-existing statistic
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticRemoveHandler("statistic-remove", params);
+    EXPECT_EQ("{ \"result\": 1, \"text\": \"No 'alpha' statistic found\" }",
+              rsp->str());
+}
+
+// This test checks whether statistic-remove-all command really resets all
+// statistics correctly.
+TEST_F(StatsMgrTest, commandRemoveAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    // Check that all of them can be reset at once
+    ConstElementPtr rsp = StatsMgr::instance().statisticRemoveAllHandler(
+        "statistic-remove-all", ElementPtr());
+    ASSERT_TRUE(rsp);
+    int status_code;
+    ConstElementPtr rep_all = parseAnswer(status_code, rsp);
+    ASSERT_EQ(0, status_code);
+    ASSERT_TRUE(rep_all);
+    std::string exp = "\"Warning: statistic-remove-all command is deprecated.";
+    exp += " All statistics removed.\"";
+    EXPECT_EQ(exp, rep_all->str());
+
+    EXPECT_FALSE(StatsMgr::instance().getObservation("alpha"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("beta"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("gamma"));
+    EXPECT_FALSE(StatsMgr::instance().getObservation("delta"));
+    EXPECT_EQ(0, StatsMgr::instance().count());
+}
+
+// This test checks whether statistic-sample-age-set command really set
+// max_sample_age_ limit correctly.
+TEST_F(StatsMgrTest, commandSetMaxSampleAge) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+    params->set("duration", Element::create(1245)); // minutes(20) + seconds(45)
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleAgeHandler("statistic-sample-age-set", params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    // check if time limit was set properly and whether count limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second,
+              minutes(20) + seconds(45));
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, false);
+}
+
+// Test checks if statistic-sample-age-set is able to handle:
+// - a request without parameters
+// - a request without duration parameter
+// - a request with missing statistic name
+// - a request for non-existing statistic.
+TEST_F(StatsMgrTest, commandSetMaxSampleAgeNegative) {
+    // Case 1: a request without parameters
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleAgeHandler("statistic-sample-age-set", ElementPtr());
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 2: a request without duration parameter
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticSetMaxSampleAgeHandler("statistic-sample-age-set", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 3: a request with missing statistic name
+    params = Element::createMap();
+    params->set("duration", Element::create(100));
+    rsp = StatsMgr::instance().statisticSetMaxSampleAgeHandler("statistic-sample-age-set", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 4: a request for non-existing statistic
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticSetMaxSampleAgeHandler("statistic-sample-age-set", params);
+    EXPECT_EQ("{ \"result\": 1, \"text\": \"No 'alpha' statistic found\" }",
+              rsp->str());
+}
+
+TEST_F(StatsMgrTest, commandSetMaxSampleAgeAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    ElementPtr params = Element::createMap();
+    params->set("duration", Element::create(3765)); // set duration to 3765 seconds
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleAgeAllHandler(params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    // check defaults
+    EXPECT_EQ(StatsMgr::instance().getMaxSampleAgeDefault(), seconds(3765));
+    EXPECT_EQ(StatsMgr::instance().getMaxSampleCountDefault(), 0);
+
+    // check if time limit was set properly and whether count limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().second,
+              dur1245);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().second,
+              dur1245);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().second,
+              dur1245);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().second,
+              dur1245);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, false);
+}
+
+// This test checks whether statistic-sample-count-set command really set
+// max_sample_count_ limit correctly.
+TEST_F(StatsMgrTest, commandSetMaxSampleCount) {
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+    params->set("max-samples", Element::create(15));
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleCountHandler("statistic-sample-count-set", params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    // check if time limit was set properly and whether duration limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 15);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+}
+
+// Test checks if statistic-sample-count-set is able to handle:
+// - a request without parameters
+// - a request without max-samples parameter
+// - a request with missing statistic name
+// - a request for non-existing statistic.
+TEST_F(StatsMgrTest, commandSetMaxSampleCountNegative) {
+    // Case 1: a request without parameters
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleCountHandler("statistic-sample-count-set", ElementPtr());
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 2: a request without max-samples parameter
+    ElementPtr params = Element::createMap();
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticSetMaxSampleCountHandler("statistic-sample-count-set", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 3: a request with missing statistic name
+    params = Element::createMap();
+    params->set("max-samples", Element::create(10));
+    rsp = StatsMgr::instance().statisticSetMaxSampleCountHandler("statistic-sample-count-set", params);
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+
+    // Case 4: a request for non-existing statistic
+    params->set("name", Element::create("alpha"));
+    rsp = StatsMgr::instance().statisticSetMaxSampleCountHandler("statistic-sample-count-set", params);
+    EXPECT_EQ("{ \"result\": 1, \"text\": \"No 'alpha' statistic found\" }",
+              rsp->str());
+}
+
+TEST_F(StatsMgrTest, commandSetMaxSampleCountAll) {
+    // Set a couple of statistics
+    StatsMgr::instance().setValue("alpha", static_cast<int64_t>(1234));
+    StatsMgr::instance().setValue("beta", 12.34);
+    StatsMgr::instance().setValue("gamma", dur1234);
+    StatsMgr::instance().setValue("delta", "Lorem ipsum");
+
+    ElementPtr params = Element::createMap();
+    params->set("max-samples", Element::create(200));
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleCountAllHandler(params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(CONTROL_RESULT_SUCCESS, status_code);
+
+    // check default
+    EXPECT_EQ(StatsMgr::instance().getMaxSampleCountDefault(), 200);
+
+    // check if count limit was set properly and whether count limit is disabled
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleCount().second, 200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("alpha")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleCount().second, 200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("beta")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleCount().second, 200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("gamma")->getMaxSampleAge().first, false);
+
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().first, true);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleCount().second, 200);
+    EXPECT_EQ(StatsMgr::instance().getObservation("delta")->getMaxSampleAge().first, false);
+}
+
+// Test checks if statistics-sample-count-set-all fails on zero.
+TEST_F(StatsMgrTest, commandSetMaxSampleCountAllZero) {
+    ElementPtr params = Element::createMap();
+    params->set("max-samples", Element::create(0));
+
+    ConstElementPtr rsp =
+        StatsMgr::instance().statisticSetMaxSampleCountAllHandler(params);
+    int status_code;
+    ASSERT_NO_THROW(parseAnswer(status_code, rsp));
+    EXPECT_EQ(status_code, CONTROL_RESULT_ERROR);
+}
+
+}
diff --git a/src/lib/stats/testutils/Makefile.am b/src/lib/stats/testutils/Makefile.am
new file mode 100644
index 0000000..009257f
--- /dev/null
+++ b/src/lib/stats/testutils/Makefile.am
@@ -0,0 +1 @@
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diff --git a/src/lib/stats/testutils/Makefile.in b/src/lib/stats/testutils/Makefile.in
new file mode 100644
index 0000000..e608be7
--- /dev/null
+++ b/src/lib/stats/testutils/Makefile.in
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+
+maintainer-clean-generic:
+	@echo "This command is intended for maintainers to use"
+	@echo "it deletes files that may require special tools to rebuild."
+clean: clean-am
+
+clean-am: clean-generic clean-libtool mostlyclean-am
+
+distclean: distclean-am
+	-rm -f Makefile
+distclean-am: clean-am distclean-generic
+
+dvi: dvi-am
+
+dvi-am:
+
+html: html-am
+
+html-am:
+
+info: info-am
+
+info-am:
+
+install-data-am:
+
+install-dvi: install-dvi-am
+
+install-dvi-am:
+
+install-exec-am:
+
+install-html: install-html-am
+
+install-html-am:
+
+install-info: install-info-am
+
+install-info-am:
+
+install-man:
+
+install-pdf: install-pdf-am
+
+install-pdf-am:
+
+install-ps: install-ps-am
+
+install-ps-am:
+
+installcheck-am:
+
+maintainer-clean: maintainer-clean-am
+	-rm -f Makefile
+maintainer-clean-am: distclean-am maintainer-clean-generic
+
+mostlyclean: mostlyclean-am
+
+mostlyclean-am: mostlyclean-generic mostlyclean-libtool
+
+pdf: pdf-am
+
+pdf-am:
+
+ps: ps-am
+
+ps-am:
+
+uninstall-am:
+
+.MAKE: install-am install-strip
+
+.PHONY: all all-am check check-am clean clean-generic clean-libtool \
+	cscopelist-am ctags-am distclean distclean-generic \
+	distclean-libtool distdir dvi dvi-am html html-am info info-am \
+	install install-am install-data install-data-am install-dvi \
+	install-dvi-am install-exec install-exec-am install-html \
+	install-html-am install-info install-info-am install-man \
+	install-pdf install-pdf-am install-ps install-ps-am \
+	install-strip installcheck installcheck-am installdirs \
+	maintainer-clean maintainer-clean-generic mostlyclean \
+	mostlyclean-generic mostlyclean-libtool pdf pdf-am ps ps-am \
+	tags-am uninstall uninstall-am
+
+.PRECIOUS: Makefile
+
+
+# Tell versions [3.59,3.63) of GNU make to not export all variables.
+# Otherwise a system limit (for SysV at least) may be exceeded.
+.NOEXPORT:
diff --git a/src/lib/stats/testutils/stats_test_utils.h b/src/lib/stats/testutils/stats_test_utils.h
new file mode 100644
index 0000000..3a3786a
--- /dev/null
+++ b/src/lib/stats/testutils/stats_test_utils.h
@@ -0,0 +1,73 @@
+// Copyright (C) 2020-2023 Internet Systems Consortium, Inc. ("ISC")
+//
+// This Source Code Form is subject to the terms of the Mozilla Public
+// License, v. 2.0. If a copy of the MPL was not distributed with this
+// file, You can obtain one at http://mozilla.org/MPL/2.0/.
+
+#ifndef STATS_TEST_UTILS_H
+#define STATS_TEST_UTILS_H
+
+#include <cc/data.h>
+#include <stats/stats_mgr.h>
+
+#include <gtest/gtest.h>
+
+namespace isc {
+namespace stats {
+namespace test {
+
+/// @brief Type of name x value for statistics.
+typedef std::map<std::string, int64_t> StatMap;
+
+/// @brief Compares a statistic to an expected value.
+///
+/// Attempt to fetch the named statistic from the StatsMgr and if
+/// found, compare its observed value to the given value.
+/// Fails if the stat is not found or if the values do not match.
+///
+/// @param name StatsMgr name for the statistic to check.
+/// @param expected_value expected value of the statistic.
+inline void checkStat(const std::string& name,
+                      const isc::util::int128_t expected_value) {
+    ObservationPtr const obs(isc::stats::StatsMgr::instance().getObservation(name));
+
+    ASSERT_TRUE(obs) << "stat " << name << " not found ";
+    if (obs->getType() == Observation::STAT_INTEGER) {
+        EXPECT_EQ(expected_value, obs->getInteger().first)
+            << " wrong value for stat " << name;
+    } else if (obs->getType() == Observation::STAT_BIG_INTEGER) {
+        EXPECT_EQ(expected_value, obs->getBigInteger().first)
+            << " wrong value for stat " << name;
+    } else {
+        GTEST_FAIL() << "unexpected statistic type: "
+                     << Observation::typeToText(obs->getType());
+    }
+}
+
+/// @brief Check if a statistic does not exists.
+///
+/// @param name StatsMgr name for the statistic to check.
+inline void checkNoStat(const std::string& name) {
+    using namespace isc::stats;
+    EXPECT_FALSE(StatsMgr::instance().getObservation(name));
+}
+
+/// @brief Compares StatsMgr statistics against expected values.
+///
+/// Iterates over a list of statistic names and expected values, attempting
+/// to fetch each from the StatsMgr and if found, compare its observed
+/// value to the expected value. Fails if any of the expected stats are not
+/// found or if the values do not match.
+///
+/// @param expected_stats Map of expected static names and values.
+inline void checkStats(const StatMap& expected_stats) {
+    for (const auto& it : expected_stats) {
+        checkStat(it.first, it.second);
+    }
+}
+
+}
+}
+}
+
+#endif // STATS_TEST_UTILS_H