Merging upstream version 1.29.0.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

8 files changed, 113 insertions, 1327 deletions

diff --git a/backends/prometheus/Makefile.in b/backends/prometheus/Makefile.in
deleted file mode 100644
index 00f857a77..000000000
--- a/backends/prometheus/Makefile.in
+++ /dev/null
@@ -1,703 +0,0 @@
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-	-rm -f TAGS ID GTAGS GRTAGS GSYMS GPATH tags
-
-distdir: $(DISTFILES)
-	@srcdirstrip=`echo "$(srcdir)" | sed 's/[].[^$$\\*]/\\\\&/g'`; \
-	topsrcdirstrip=`echo "$(top_srcdir)" | sed 's/[].[^$$\\*]/\\\\&/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="$(top_distdir)"; \
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-	    install_sh_PROGRAM="$(INSTALL_STRIP_PROGRAM)" INSTALL_STRIP_FLAG=-s \
-	      install; \
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-	  $(MAKE) $(AM_MAKEFLAGS) INSTALL_PROGRAM="$(INSTALL_STRIP_PROGRAM)" \
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-	fi
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-distclean-generic:
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-maintainer-clean-generic:
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-# Tell versions [3.59,3.63) of GNU make to not export all variables.
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diff --git a/backends/prometheus/README.md b/backends/prometheus/README.md
index e234efe94..10275fa20 100644
--- a/backends/prometheus/README.md
+++ b/backends/prometheus/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Using Netdata with Prometheus"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/backends/prometheus/README.md
+-->
+
 # Using Netdata with Prometheus
 
 > IMPORTANT: the format Netdata sends metrics to prometheus has changed since Netdata v1.7. The new prometheus backend
@@ -12,7 +17,7 @@ are starting at a fresh ubuntu shell (whether you'd like to follow along in a VM
 
 ### Installing Netdata
 
-There are number of ways to install Netdata according to [Installation](../../packaging/installer/). The suggested way
+There are number of ways to install Netdata according to [Installation](/packaging/installer/README.md). The suggested way
 of installing the latest Netdata and keep it upgrade automatically. Using one line installation:
 
 ```sh
@@ -349,7 +354,7 @@ For more information check prometheus documentation.
 
 ### Streaming data from upstream hosts
 
-The `format=prometheus` parameter only exports the host's Netdata metrics. If you are using the master/slave
+The `format=prometheus` parameter only exports the host's Netdata metrics. If you are using the parent-child
 functionality of Netdata this ignores any upstream hosts - so you should consider using the below in your
 **prometheus.yml**:
 
@@ -381,6 +386,8 @@ To save bandwidth, and because prometheus does not use them anyway, `# TYPE` and
 wanted they can be re-enabled via `types=yes` and `help=yes`, e.g.
 `/api/v1/allmetrics?format=prometheus&types=yes&help=yes`
 
+Note that if enabled, the `# TYPE` and `# HELP` lines are repeated for every occurrence of a metric, which goes against the Prometheus documentation's [specification for these lines](https://github.com/prometheus/docs/blob/master/content/docs/instrumenting/exposition_formats.md#comments-help-text-and-type-information).
+
 ### Names and IDs
 
 Netdata supports names and IDs for charts and dimensions. Usually IDs are unique identifiers as read by the system and
diff --git a/backends/prometheus/backend_prometheus.c b/backends/prometheus/backend_prometheus.c
index 03323ac54..a3ecf16ef 100644
--- a/backends/prometheus/backend_prometheus.c
+++ b/backends/prometheus/backend_prometheus.c
@@ -44,7 +44,7 @@ static inline time_t prometheus_server_last_access(const char *server, RRDHOST *
     return 0;
 }
 
-static inline size_t prometheus_name_copy(char *d, const char *s, size_t usable) {
+static inline size_t backends_prometheus_name_copy(char *d, const char *s, size_t usable) {
     size_t n;
 
     for(n = 0; *s && n < usable ; d++, s++, n++) {
@@ -58,7 +58,7 @@ static inline size_t prometheus_name_copy(char *d, const char *s, size_t usable)
     return n;
 }
 
-static inline size_t prometheus_label_copy(char *d, const char *s, size_t usable) {
+static inline size_t backends_prometheus_label_copy(char *d, const char *s, size_t usable) {
     size_t n;
 
     // make sure we can escape one character without overflowing the buffer
@@ -78,7 +78,7 @@ static inline size_t prometheus_label_copy(char *d, const char *s, size_t usable
     return n;
 }
 
-static inline char *prometheus_units_copy(char *d, const char *s, size_t usable, int showoldunits) {
+static inline char *backends_prometheus_units_copy(char *d, const char *s, size_t usable, int showoldunits) {
     const char *sorig = s;
     char *ret = d;
     size_t n;
@@ -159,7 +159,7 @@ struct host_variables_callback_options {
     RRDHOST *host;
     BUFFER *wb;
     BACKEND_OPTIONS backend_options;
-    PROMETHEUS_OUTPUT_OPTIONS output_options;
+    BACKENDS_PROMETHEUS_OUTPUT_OPTIONS output_options;
     const char *prefix;
     const char *labels;
     time_t now;
@@ -174,14 +174,14 @@ static int print_host_variables(RRDVAR *rv, void *data) {
         if(!opts->host_header_printed) {
             opts->host_header_printed = 1;
 
-            if(opts->output_options & PROMETHEUS_OUTPUT_HELP) {
+            if(opts->output_options & BACKENDS_PROMETHEUS_OUTPUT_HELP) {
                 buffer_sprintf(opts->wb, "\n# COMMENT global host and chart variables\n");
             }
         }
 
         calculated_number value = rrdvar2number(rv);
         if(isnan(value) || isinf(value)) {
-            if(opts->output_options & PROMETHEUS_OUTPUT_HELP)
+            if(opts->output_options & BACKENDS_PROMETHEUS_OUTPUT_HELP)
                 buffer_sprintf(opts->wb, "# COMMENT variable \"%s\" is %s. Skipped.\n", rv->name, (isnan(value))?"NAN":"INF");
 
             return 0;
@@ -194,9 +194,9 @@ static int print_host_variables(RRDVAR *rv, void *data) {
             label_post = "}";
         }
 
-        prometheus_name_copy(opts->name, rv->name, sizeof(opts->name));
+        backends_prometheus_name_copy(opts->name, rv->name, sizeof(opts->name));
 
-        if(opts->output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
+        if(opts->output_options & BACKENDS_PROMETHEUS_OUTPUT_TIMESTAMPS)
             buffer_sprintf(opts->wb
                            , "%s_%s%s%s%s " CALCULATED_NUMBER_FORMAT " %llu\n"
                            , opts->prefix
@@ -205,7 +205,7 @@ static int print_host_variables(RRDVAR *rv, void *data) {
                            , opts->labels
                            , label_post
                            , value
-                           , ((rv->last_updated) ? rv->last_updated : opts->now) * 1000ULL
+                           , opts->now * 1000ULL
             );
         else
             buffer_sprintf(opts->wb, "%s_%s%s%s%s " CALCULATED_NUMBER_FORMAT "\n"
@@ -223,21 +223,21 @@ static int print_host_variables(RRDVAR *rv, void *data) {
     return 0;
 }
 
-static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER *wb, const char *prefix, BACKEND_OPTIONS backend_options, time_t after, time_t before, int allhosts, PROMETHEUS_OUTPUT_OPTIONS output_options) {
+static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER *wb, const char *prefix, BACKEND_OPTIONS backend_options, time_t after, time_t before, int allhosts, BACKENDS_PROMETHEUS_OUTPUT_OPTIONS output_options) {
     rrdhost_rdlock(host);
 
     char hostname[PROMETHEUS_ELEMENT_MAX + 1];
-    prometheus_label_copy(hostname, host->hostname, PROMETHEUS_ELEMENT_MAX);
+    backends_prometheus_label_copy(hostname, host->hostname, PROMETHEUS_ELEMENT_MAX);
 
     char labels[PROMETHEUS_LABELS_MAX + 1] = "";
     if(allhosts) {
-        if(output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
+        if(output_options & BACKENDS_PROMETHEUS_OUTPUT_TIMESTAMPS)
             buffer_sprintf(wb, "netdata_info{instance=\"%s\",application=\"%s\",version=\"%s\"} 1 %llu\n", hostname, host->program_name, host->program_version, now_realtime_usec() / USEC_PER_MS);
         else
             buffer_sprintf(wb, "netdata_info{instance=\"%s\",application=\"%s\",version=\"%s\"} 1\n", hostname, host->program_name, host->program_version);
 
         if(host->tags && *(host->tags)) {
-            if(output_options & PROMETHEUS_OUTPUT_TIMESTAMPS) {
+            if(output_options & BACKENDS_PROMETHEUS_OUTPUT_TIMESTAMPS) {
                 buffer_sprintf(wb, "netdata_host_tags_info{instance=\"%s\",%s} 1 %llu\n", hostname, host->tags, now_realtime_usec() / USEC_PER_MS);
 
                 // deprecated, exists only for compatibility with older queries
@@ -255,13 +255,13 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
         snprintfz(labels, PROMETHEUS_LABELS_MAX, ",instance=\"%s\"", hostname);
     }
     else {
-        if(output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
+        if(output_options & BACKENDS_PROMETHEUS_OUTPUT_TIMESTAMPS)
             buffer_sprintf(wb, "netdata_info{instance=\"%s\",application=\"%s\",version=\"%s\"} 1 %llu\n", hostname, host->program_name, host->program_version, now_realtime_usec() / USEC_PER_MS);
         else
             buffer_sprintf(wb, "netdata_info{instance=\"%s\",application=\"%s\",version=\"%s\"} 1\n", hostname, host->program_name, host->program_version);
 
         if(host->tags && *(host->tags)) {
-            if(output_options & PROMETHEUS_OUTPUT_TIMESTAMPS) {
+            if(output_options & BACKENDS_PROMETHEUS_OUTPUT_TIMESTAMPS) {
                 buffer_sprintf(wb, "netdata_host_tags_info{%s} 1 %llu\n", host->tags, now_realtime_usec() / USEC_PER_MS);
 
                 // deprecated, exists only for compatibility with older queries
@@ -277,7 +277,7 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
     }
 
     // send custom variables set for the host
-    if(output_options & PROMETHEUS_OUTPUT_VARIABLES){
+    if(output_options & BACKENDS_PROMETHEUS_OUTPUT_VARIABLES){
         struct host_variables_callback_options opts = {
                 .host = host,
                 .wb = wb,
@@ -299,9 +299,9 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
         char family[PROMETHEUS_ELEMENT_MAX + 1];
         char units[PROMETHEUS_ELEMENT_MAX + 1] = "";
 
-        prometheus_label_copy(chart, (output_options & PROMETHEUS_OUTPUT_NAMES && st->name)?st->name:st->id, PROMETHEUS_ELEMENT_MAX);
-        prometheus_label_copy(family, st->family, PROMETHEUS_ELEMENT_MAX);
-        prometheus_name_copy(context, st->context, PROMETHEUS_ELEMENT_MAX);
+        backends_prometheus_label_copy(chart, (output_options & BACKENDS_PROMETHEUS_OUTPUT_NAMES && st->name)?st->name:st->id, PROMETHEUS_ELEMENT_MAX);
+        backends_prometheus_label_copy(family, st->family, PROMETHEUS_ELEMENT_MAX);
+        backends_prometheus_name_copy(context, st->context, PROMETHEUS_ELEMENT_MAX);
 
         if(likely(backends_can_send_rrdset(backend_options, st))) {
             rrdset_rdlock(st);
@@ -316,14 +316,14 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
                     homogeneous = 0;
             }
             else {
-                if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AVERAGE && !(output_options & PROMETHEUS_OUTPUT_HIDEUNITS))
-                    prometheus_units_copy(units, st->units, PROMETHEUS_ELEMENT_MAX, output_options & PROMETHEUS_OUTPUT_OLDUNITS);
+                if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AVERAGE && !(output_options & BACKENDS_PROMETHEUS_OUTPUT_HIDEUNITS))
+                    backends_prometheus_units_copy(units, st->units, PROMETHEUS_ELEMENT_MAX, output_options & BACKENDS_PROMETHEUS_OUTPUT_OLDUNITS);
             }
 
-            if(unlikely(output_options & PROMETHEUS_OUTPUT_HELP))
+            if(unlikely(output_options & BACKENDS_PROMETHEUS_OUTPUT_HELP))
                 buffer_sprintf(wb, "\n# COMMENT %s chart \"%s\", context \"%s\", family \"%s\", units \"%s\"\n"
                                , (homogeneous)?"homogeneous":"heterogeneous"
-                               , (output_options & PROMETHEUS_OUTPUT_NAMES && st->name) ? st->name : st->id
+                               , (output_options & BACKENDS_PROMETHEUS_OUTPUT_NAMES && st->name) ? st->name : st->id
                                , st->context
                                , st->family
                                , st->units
@@ -354,18 +354,18 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
                             // all the dimensions of the chart, has the same algorithm, multiplier and divisor
                             // we add all dimensions as labels
 
-                            prometheus_label_copy(dimension, (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
+                            backends_prometheus_label_copy(dimension, (output_options & BACKENDS_PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
 
-                            if(unlikely(output_options & PROMETHEUS_OUTPUT_HELP))
+                            if(unlikely(output_options & BACKENDS_PROMETHEUS_OUTPUT_HELP))
                                 buffer_sprintf(wb
                                                , "# COMMENT %s_%s%s: chart \"%s\", context \"%s\", family \"%s\", dimension \"%s\", value * " COLLECTED_NUMBER_FORMAT " / " COLLECTED_NUMBER_FORMAT " %s %s (%s)\n"
                                                , prefix
                                                , context
                                                , suffix
-                                               , (output_options & PROMETHEUS_OUTPUT_NAMES && st->name) ? st->name : st->id
+                                               , (output_options & BACKENDS_PROMETHEUS_OUTPUT_NAMES && st->name) ? st->name : st->id
                                                , st->context
                                                , st->family
-                                               , (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id
+                                               , (output_options & BACKENDS_PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id
                                                , rd->multiplier
                                                , rd->divisor
                                                , h
@@ -373,15 +373,15 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
                                                , t
                                 );
 
-                            if(unlikely(output_options & PROMETHEUS_OUTPUT_TYPES))
-                                buffer_sprintf(wb, "# COMMENT TYPE %s_%s%s %s\n"
+                            if(unlikely(output_options & BACKENDS_PROMETHEUS_OUTPUT_TYPES))
+                                buffer_sprintf(wb, "# TYPE %s_%s%s %s\n"
                                                , prefix
                                                , context
                                                , suffix
                                                , t
                                 );
 
-                            if(output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
+                            if(output_options & BACKENDS_PROMETHEUS_OUTPUT_TIMESTAMPS)
                                 buffer_sprintf(wb
                                                , "%s_%s%s{chart=\"%s\",family=\"%s\",dimension=\"%s\"%s} " COLLECTED_NUMBER_FORMAT " %llu\n"
                                                , prefix
@@ -411,19 +411,19 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
                             // the dimensions of the chart, do not have the same algorithm, multiplier or divisor
                             // we create a metric per dimension
 
-                            prometheus_name_copy(dimension, (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
+                            backends_prometheus_name_copy(dimension, (output_options & BACKENDS_PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
 
-                            if(unlikely(output_options & PROMETHEUS_OUTPUT_HELP))
+                            if(unlikely(output_options & BACKENDS_PROMETHEUS_OUTPUT_HELP))
                                 buffer_sprintf(wb
                                                , "# COMMENT %s_%s_%s%s: chart \"%s\", context \"%s\", family \"%s\", dimension \"%s\", value * " COLLECTED_NUMBER_FORMAT " / " COLLECTED_NUMBER_FORMAT " %s %s (%s)\n"
                                                , prefix
                                                , context
                                                , dimension
                                                , suffix
-                                               , (output_options & PROMETHEUS_OUTPUT_NAMES && st->name) ? st->name : st->id
+                                               , (output_options & BACKENDS_PROMETHEUS_OUTPUT_NAMES && st->name) ? st->name : st->id
                                                , st->context
                                                , st->family
-                                               , (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id
+                                               , (output_options & BACKENDS_PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id
                                                , rd->multiplier
                                                , rd->divisor
                                                , h
@@ -431,8 +431,8 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
                                                , t
                                 );
 
-                            if(unlikely(output_options & PROMETHEUS_OUTPUT_TYPES))
-                                buffer_sprintf(wb, "# COMMENT TYPE %s_%s_%s%s %s\n"
+                            if(unlikely(output_options & BACKENDS_PROMETHEUS_OUTPUT_TYPES))
+                                buffer_sprintf(wb, "# TYPE %s_%s_%s%s %s\n"
                                                , prefix
                                                , context
                                                , dimension
@@ -440,7 +440,7 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
                                                , t
                                 );
 
-                            if(output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
+                            if(output_options & BACKENDS_PROMETHEUS_OUTPUT_TIMESTAMPS)
                                 buffer_sprintf(wb
                                                , "%s_%s_%s%s{chart=\"%s\",family=\"%s\"%s} " COLLECTED_NUMBER_FORMAT " %llu\n"
                                                , prefix
@@ -480,29 +480,29 @@ static void rrd_stats_api_v1_charts_allmetrics_prometheus(RRDHOST *host, BUFFER
                             else if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_SUM)
                                 suffix = "_sum";
 
-                            prometheus_label_copy(dimension, (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
+                            backends_prometheus_label_copy(dimension, (output_options & BACKENDS_PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
 
-                            if (unlikely(output_options & PROMETHEUS_OUTPUT_HELP))
+                            if (unlikely(output_options & BACKENDS_PROMETHEUS_OUTPUT_HELP))
                                 buffer_sprintf(wb, "# COMMENT %s_%s%s%s: dimension \"%s\", value is %s, gauge, dt %llu to %llu inclusive\n"
                                                , prefix
                                                , context
                                                , units
                                                , suffix
-                                               , (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id
+                                               , (output_options & BACKENDS_PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id
                                                , st->units
                                                , (unsigned long long)first_t
                                                , (unsigned long long)last_t
                                 );
 
-                            if (unlikely(output_options & PROMETHEUS_OUTPUT_TYPES))
-                                buffer_sprintf(wb, "# COMMENT TYPE %s_%s%s%s gauge\n"
+                            if (unlikely(output_options & BACKENDS_PROMETHEUS_OUTPUT_TYPES))
+                                buffer_sprintf(wb, "# TYPE %s_%s%s%s gauge\n"
                                                , prefix
                                                , context
                                                , units
                                                , suffix
                                 );
 
-                            if(output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
+                            if(output_options & BACKENDS_PROMETHEUS_OUTPUT_TIMESTAMPS)
                                 buffer_sprintf(wb, "%s_%s%s%s{chart=\"%s\",family=\"%s\",dimension=\"%s\"%s} " CALCULATED_NUMBER_FORMAT " %llu\n"
                                                , prefix
                                                , context
@@ -581,7 +581,7 @@ inline static void remote_write_split_words(char *str, char **words, int max_wor
     }
 }
 
-void rrd_stats_remote_write_allmetrics_prometheus(
+void backends_rrd_stats_remote_write_allmetrics_prometheus(
         RRDHOST *host
         , const char *__hostname
         , const char *prefix
@@ -593,9 +593,9 @@ void rrd_stats_remote_write_allmetrics_prometheus(
         , size_t *count_dims_skipped
 ) {
     char hostname[PROMETHEUS_ELEMENT_MAX + 1];
-    prometheus_label_copy(hostname, __hostname, PROMETHEUS_ELEMENT_MAX);
+    backends_prometheus_label_copy(hostname, __hostname, PROMETHEUS_ELEMENT_MAX);
 
-    add_host_info("netdata_info", hostname, host->program_name, host->program_version, now_realtime_usec() / USEC_PER_MS);
+    backends_add_host_info("netdata_info", hostname, host->program_name, host->program_version, now_realtime_usec() / USEC_PER_MS);
 
     if(host->tags && *(host->tags)) {
         char tags[PROMETHEUS_LABELS_MAX + 1];
@@ -605,10 +605,10 @@ void rrd_stats_remote_write_allmetrics_prometheus(
 
         remote_write_split_words(tags, words, PROMETHEUS_LABELS_MAX_NUMBER);
 
-        add_host_info("netdata_host_tags_info", hostname, NULL, NULL, now_realtime_usec() / USEC_PER_MS);
+        backends_add_host_info("netdata_host_tags_info", hostname, NULL, NULL, now_realtime_usec() / USEC_PER_MS);
 
         for(i = 0; words[i] != NULL && words[i + 1] != NULL && (i + 1) < PROMETHEUS_LABELS_MAX_NUMBER; i += 2) {
-            add_tag(words[i], words[i + 1]);
+            backends_add_tag(words[i], words[i + 1]);
         }
     }
 
@@ -620,9 +620,9 @@ void rrd_stats_remote_write_allmetrics_prometheus(
         char family[PROMETHEUS_ELEMENT_MAX + 1];
         char units[PROMETHEUS_ELEMENT_MAX + 1] = "";
 
-        prometheus_label_copy(chart, (backend_options & BACKEND_OPTION_SEND_NAMES && st->name)?st->name:st->id, PROMETHEUS_ELEMENT_MAX);
-        prometheus_label_copy(family, st->family, PROMETHEUS_ELEMENT_MAX);
-        prometheus_name_copy(context, st->context, PROMETHEUS_ELEMENT_MAX);
+        backends_prometheus_label_copy(chart, (backend_options & BACKEND_OPTION_SEND_NAMES && st->name)?st->name:st->id, PROMETHEUS_ELEMENT_MAX);
+        backends_prometheus_label_copy(family, st->family, PROMETHEUS_ELEMENT_MAX);
+        backends_prometheus_name_copy(context, st->context, PROMETHEUS_ELEMENT_MAX);
 
         if(likely(backends_can_send_rrdset(backend_options, st))) {
             rrdset_rdlock(st);
@@ -640,7 +640,7 @@ void rrd_stats_remote_write_allmetrics_prometheus(
             }
             else {
                 if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AVERAGE)
-                    prometheus_units_copy(units, st->units, PROMETHEUS_ELEMENT_MAX, 0);
+                    backends_prometheus_units_copy(units, st->units, PROMETHEUS_ELEMENT_MAX, 0);
             }
 
             // for each dimension
@@ -664,20 +664,20 @@ void rrd_stats_remote_write_allmetrics_prometheus(
                             // all the dimensions of the chart, has the same algorithm, multiplier and divisor
                             // we add all dimensions as labels
 
-                            prometheus_label_copy(dimension, (backend_options & BACKEND_OPTION_SEND_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
+                            backends_prometheus_label_copy(dimension, (backend_options & BACKEND_OPTION_SEND_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
                             snprintf(name, PROMETHEUS_LABELS_MAX, "%s_%s%s", prefix, context, suffix);
 
-                            add_metric(name, chart, family, dimension, hostname, rd->last_collected_value, timeval_msec(&rd->last_collected_time));
+                            backends_add_metric(name, chart, family, dimension, hostname, rd->last_collected_value, timeval_msec(&rd->last_collected_time));
                             (*count_dims)++;
                         }
                         else {
                             // the dimensions of the chart, do not have the same algorithm, multiplier or divisor
                             // we create a metric per dimension
 
-                            prometheus_name_copy(dimension, (backend_options & BACKEND_OPTION_SEND_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
+                            backends_prometheus_name_copy(dimension, (backend_options & BACKEND_OPTION_SEND_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
                             snprintf(name, PROMETHEUS_LABELS_MAX, "%s_%s_%s%s", prefix, context, dimension, suffix);
 
-                            add_metric(name, chart, family, NULL, hostname, rd->last_collected_value, timeval_msec(&rd->last_collected_time));
+                            backends_add_metric(name, chart, family, NULL, hostname, rd->last_collected_value, timeval_msec(&rd->last_collected_time));
                             (*count_dims)++;
                         }
                     }
@@ -694,10 +694,10 @@ void rrd_stats_remote_write_allmetrics_prometheus(
                             else if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_SUM)
                                 suffix = "_sum";
 
-                            prometheus_label_copy(dimension, (backend_options & BACKEND_OPTION_SEND_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
+                            backends_prometheus_label_copy(dimension, (backend_options & BACKEND_OPTION_SEND_NAMES && rd->name) ? rd->name : rd->id, PROMETHEUS_ELEMENT_MAX);
                             snprintf(name, PROMETHEUS_LABELS_MAX, "%s_%s%s%s", prefix, context, units, suffix);
 
-                            add_metric(name, chart, family, dimension, hostname, rd->last_collected_value, timeval_msec(&rd->last_collected_time));
+                            backends_add_metric(name, chart, family, dimension, hostname, value, last_t * MSEC_PER_SEC);
                             (*count_dims)++;
                         }
                     }
@@ -710,7 +710,7 @@ void rrd_stats_remote_write_allmetrics_prometheus(
 }
 #endif /* ENABLE_PROMETHEUS_REMOTE_WRITE */
 
-static inline time_t prometheus_preparation(RRDHOST *host, BUFFER *wb, BACKEND_OPTIONS backend_options, const char *server, time_t now, PROMETHEUS_OUTPUT_OPTIONS output_options) {
+static inline time_t prometheus_preparation(RRDHOST *host, BUFFER *wb, BACKEND_OPTIONS backend_options, const char *server, time_t now, BACKENDS_PROMETHEUS_OUTPUT_OPTIONS output_options) {
     if(!server || !*server) server = "default";
 
     time_t after  = prometheus_server_last_access(server, host, now);
@@ -726,7 +726,7 @@ static inline time_t prometheus_preparation(RRDHOST *host, BUFFER *wb, BACKEND_O
         after = now - global_backend_update_every;
     }
 
-    if(output_options & PROMETHEUS_OUTPUT_HELP) {
+    if(output_options & BACKENDS_PROMETHEUS_OUTPUT_HELP) {
         char *mode;
         if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED)
             mode = "as collected";
@@ -751,7 +751,7 @@ static inline time_t prometheus_preparation(RRDHOST *host, BUFFER *wb, BACKEND_O
     return after;
 }
 
-void rrd_stats_api_v1_charts_allmetrics_prometheus_single_host(RRDHOST *host, BUFFER *wb, const char *server, const char *prefix, BACKEND_OPTIONS backend_options, PROMETHEUS_OUTPUT_OPTIONS output_options) {
+void backends_rrd_stats_api_v1_charts_allmetrics_prometheus_single_host(RRDHOST *host, BUFFER *wb, const char *server, const char *prefix, BACKEND_OPTIONS backend_options, BACKENDS_PROMETHEUS_OUTPUT_OPTIONS output_options) {
     time_t before = now_realtime_sec();
 
     // we start at the point we had stopped before
@@ -760,7 +760,7 @@ void rrd_stats_api_v1_charts_allmetrics_prometheus_single_host(RRDHOST *host, BU
     rrd_stats_api_v1_charts_allmetrics_prometheus(host, wb, prefix, backend_options, after, before, 0, output_options);
 }
 
-void rrd_stats_api_v1_charts_allmetrics_prometheus_all_hosts(RRDHOST *host, BUFFER *wb, const char *server, const char *prefix, BACKEND_OPTIONS backend_options, PROMETHEUS_OUTPUT_OPTIONS output_options) {
+void backends_rrd_stats_api_v1_charts_allmetrics_prometheus_all_hosts(RRDHOST *host, BUFFER *wb, const char *server, const char *prefix, BACKEND_OPTIONS backend_options, BACKENDS_PROMETHEUS_OUTPUT_OPTIONS output_options) {
     time_t before = now_realtime_sec();
 
     // we start at the point we had stopped before
@@ -774,7 +774,7 @@ void rrd_stats_api_v1_charts_allmetrics_prometheus_all_hosts(RRDHOST *host, BUFF
 }
 
 #if ENABLE_PROMETHEUS_REMOTE_WRITE
-int process_prometheus_remote_write_response(BUFFER *b) {
+int backends_process_prometheus_remote_write_response(BUFFER *b) {
     if(unlikely(!b)) return 1;
 
     const char *s = buffer_tostring(b);
diff --git a/backends/prometheus/backend_prometheus.h b/backends/prometheus/backend_prometheus.h
index d58d24004..8c14ddc26 100644
--- a/backends/prometheus/backend_prometheus.h
+++ b/backends/prometheus/backend_prometheus.h
@@ -5,22 +5,22 @@
 
 #include "backends/backends.h"
 
-typedef enum prometheus_output_flags {
-    PROMETHEUS_OUTPUT_NONE       = 0,
-    PROMETHEUS_OUTPUT_HELP       = (1 << 0),
-    PROMETHEUS_OUTPUT_TYPES      = (1 << 1),
-    PROMETHEUS_OUTPUT_NAMES      = (1 << 2),
-    PROMETHEUS_OUTPUT_TIMESTAMPS = (1 << 3),
-    PROMETHEUS_OUTPUT_VARIABLES  = (1 << 4),
-	PROMETHEUS_OUTPUT_OLDUNITS   = (1 << 5),
-	PROMETHEUS_OUTPUT_HIDEUNITS  = (1 << 6)
-} PROMETHEUS_OUTPUT_OPTIONS;
+typedef enum backends_prometheus_output_flags {
+    BACKENDS_PROMETHEUS_OUTPUT_NONE       = 0,
+    BACKENDS_PROMETHEUS_OUTPUT_HELP       = (1 << 0),
+    BACKENDS_PROMETHEUS_OUTPUT_TYPES      = (1 << 1),
+    BACKENDS_PROMETHEUS_OUTPUT_NAMES      = (1 << 2),
+    BACKENDS_PROMETHEUS_OUTPUT_TIMESTAMPS = (1 << 3),
+    BACKENDS_PROMETHEUS_OUTPUT_VARIABLES  = (1 << 4),
+    BACKENDS_PROMETHEUS_OUTPUT_OLDUNITS   = (1 << 5),
+    BACKENDS_PROMETHEUS_OUTPUT_HIDEUNITS  = (1 << 6)
+} BACKENDS_PROMETHEUS_OUTPUT_OPTIONS;
 
-extern void rrd_stats_api_v1_charts_allmetrics_prometheus_single_host(RRDHOST *host, BUFFER *wb, const char *server, const char *prefix, BACKEND_OPTIONS backend_options, PROMETHEUS_OUTPUT_OPTIONS output_options);
-extern void rrd_stats_api_v1_charts_allmetrics_prometheus_all_hosts(RRDHOST *host, BUFFER *wb, const char *server, const char *prefix, BACKEND_OPTIONS backend_options, PROMETHEUS_OUTPUT_OPTIONS output_options);
+extern void backends_rrd_stats_api_v1_charts_allmetrics_prometheus_single_host(RRDHOST *host, BUFFER *wb, const char *server, const char *prefix, BACKEND_OPTIONS backend_options, BACKENDS_PROMETHEUS_OUTPUT_OPTIONS output_options);
+extern void backends_rrd_stats_api_v1_charts_allmetrics_prometheus_all_hosts(RRDHOST *host, BUFFER *wb, const char *server, const char *prefix, BACKEND_OPTIONS backend_options, BACKENDS_PROMETHEUS_OUTPUT_OPTIONS output_options);
 
 #if ENABLE_PROMETHEUS_REMOTE_WRITE
-extern void rrd_stats_remote_write_allmetrics_prometheus(
+extern void backends_rrd_stats_remote_write_allmetrics_prometheus(
         RRDHOST *host
         , const char *__hostname
         , const char *prefix
@@ -31,7 +31,7 @@ extern void rrd_stats_remote_write_allmetrics_prometheus(
         , size_t *count_dims
         , size_t *count_dims_skipped
 );
-extern int process_prometheus_remote_write_response(BUFFER *b);
+extern int backends_process_prometheus_remote_write_response(BUFFER *b);
 #endif
 
 #endif //NETDATA_BACKEND_PROMETHEUS_H
diff --git a/backends/prometheus/remote_write/Makefile.in b/backends/prometheus/remote_write/Makefile.in
deleted file mode 100644
index 12e8d6d73..000000000
--- a/backends/prometheus/remote_write/Makefile.in
+++ /dev/null
@@ -1,526 +0,0 @@
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diff --git a/backends/prometheus/remote_write/README.md b/backends/prometheus/remote_write/README.md
index 009ded608..b83575e10 100644
--- a/backends/prometheus/remote_write/README.md
+++ b/backends/prometheus/remote_write/README.md
@@ -1,3 +1,8 @@
+<!--
+title: "Prometheus remote write backend"
+custom_edit_url: https://github.com/netdata/netdata/edit/master/backends/prometheus/remote_write/README.md
+-->
+
 # Prometheus remote write backend
 
 ## Prerequisites
diff --git a/backends/prometheus/remote_write/remote_write.cc b/backends/prometheus/remote_write/remote_write.cc
index 91d4305ba..9448595c1 100644
--- a/backends/prometheus/remote_write/remote_write.cc
+++ b/backends/prometheus/remote_write/remote_write.cc
@@ -6,20 +6,19 @@
 
 using namespace prometheus;
 
+static google::protobuf::Arena arena;
+static WriteRequest *write_request;
 
-google::protobuf::Arena arena;
-WriteRequest *write_request;
-
-void init_write_request() {
+void backends_init_write_request() {
     GOOGLE_PROTOBUF_VERIFY_VERSION;
     write_request = google::protobuf::Arena::CreateMessage<WriteRequest>(&arena);
 }
 
-void clear_write_request() {
+void backends_clear_write_request() {
     write_request->clear_timeseries();
 }
 
-void add_host_info(const char *name, const char *instance, const char *application, const char *version, const int64_t timestamp) {
+void backends_add_host_info(const char *name, const char *instance, const char *application, const char *version, const int64_t timestamp) {
     TimeSeries *timeseries;
     Sample *sample;
     Label *label;
@@ -52,7 +51,7 @@ void add_host_info(const char *name, const char *instance, const char *applicati
 }
 
 // adds tag to the last created timeseries
-void add_tag(char *tag, char *value) {
+void backends_add_tag(char *tag, char *value) {
     TimeSeries *timeseries;
     Label *label;
 
@@ -63,7 +62,7 @@ void add_tag(char *tag, char *value) {
     label->set_value(value);
 }
 
-void add_metric(const char *name, const char *chart, const char *family, const char *dimension, const char *instance, const double value, const int64_t timestamp) {
+void backends_add_metric(const char *name, const char *chart, const char *family, const char *dimension, const char *instance, const double value, const int64_t timestamp) {
     TimeSeries *timeseries;
     Sample *sample;
     Label *label;
@@ -97,13 +96,17 @@ void add_metric(const char *name, const char *chart, const char *family, const c
     sample->set_timestamp(timestamp);
 }
 
-size_t get_write_request_size(){
+size_t backends_get_write_request_size(){
+#if GOOGLE_PROTOBUF_VERSION < 3001000
     size_t size = (size_t)snappy::MaxCompressedLength(write_request->ByteSize());
+#else
+    size_t size = (size_t)snappy::MaxCompressedLength(write_request->ByteSizeLong());
+#endif
 
     return (size < INT_MAX)?size:0;
 }
 
-int pack_write_request(char *buffer, size_t *size) {
+int backends_pack_write_request(char *buffer, size_t *size) {
     std::string uncompressed_write_request;
     if(write_request->SerializeToString(&uncompressed_write_request) == false) return 1;
 
@@ -112,6 +115,6 @@ int pack_write_request(char *buffer, size_t *size) {
     return 0;
 }
 
-void protocol_buffers_shutdown() {
+void backends_protocol_buffers_shutdown() {
     google::protobuf::ShutdownProtobufLibrary();
 }
diff --git a/backends/prometheus/remote_write/remote_write.h b/backends/prometheus/remote_write/remote_write.h
index edcc477b8..1307d7281 100644
--- a/backends/prometheus/remote_write/remote_write.h
+++ b/backends/prometheus/remote_write/remote_write.h
@@ -7,21 +7,21 @@
 extern "C" {
 #endif
 
-void init_write_request();
+void backends_init_write_request();
 
-void clear_write_request();
+void backends_clear_write_request();
 
-void add_host_info(const char *name, const char *instance, const char *application, const char *version, const int64_t timestamp);
+void backends_add_host_info(const char *name, const char *instance, const char *application, const char *version, const int64_t timestamp);
 
-void add_tag(char *tag, char *value);
+void backends_add_tag(char *tag, char *value);
 
-void add_metric(const char *name, const char *chart, const char *family, const char *dimension, const char *instance, const double value, const int64_t timestamp);
+void backends_add_metric(const char *name, const char *chart, const char *family, const char *dimension, const char *instance, const double value, const int64_t timestamp);
 
-size_t get_write_request_size();
+size_t backends_get_write_request_size();
 
-int pack_write_request(char *buffer, size_t *size);
+int backends_pack_write_request(char *buffer, size_t *size);
 
-void protocol_buffers_shutdown();
+void backends_protocol_buffers_shutdown();
 
 #ifdef __cplusplus
 }