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diff --git a/src/lib/dhcpsrv/hosts_log.h b/src/lib/dhcpsrv/hosts_log.h
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+++ b/src/lib/dhcpsrv/hosts_log.h
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+// Copyright (C) 2015-2018 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 HOSTS_LOG_H
+#define HOSTS_LOG_H
+
+#include <dhcpsrv/hosts_messages.h>
+#include <log/macros.h>
+
+namespace isc {
+namespace dhcp {
+
+///@{
+/// \brief Logging levels for the host reservations management.
+///
+/// Defines the levels used to output debug messages during the host
+/// reservations management, i.e. retrieving and adding host reservations.
+/// Note that higher numbers equate to more verbose(and detailed) output.
+
+/// @brief Traces normal operations
+///
+/// An example of the normal operation is the call to one of the functions
+/// which retrieve the reservations or add new reservation.
+extern const int HOSTS_DBG_TRACE;
+
+/// @brief Records the results of the lookups
+///
+/// Messages logged at this level will typically contain summary of the
+/// data retrieved.
+extern const int HOSTS_DBG_RESULTS;
+
+/// @brief Record detailed traces
+///
+/// Messages logged at this level will log detailed tracing information.
+extern const int HOSTS_DBG_TRACE_DETAIL;
+
+/// @brief Records detailed results of lookups.
+///
+/// Messages logged at this level will contain detailed results.
+extern const int HOSTS_DBG_TRACE_DETAIL_DATA;
+
+///@}
+
+/// @brief Logger for the @c HostMgr and the code it calls.
+///
+/// Define the logger used to log messages in @c HostMgr and the code it
+/// calls to manage host reservations.
+extern isc::log::Logger hosts_logger;
+
+} // namespace dhcp
+} // namespace isc
+
+#endif // HOSTS_LOG_H