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-rw-r--r--exporting/prometheus/prometheus.c916
1 files changed, 916 insertions, 0 deletions
diff --git a/exporting/prometheus/prometheus.c b/exporting/prometheus/prometheus.c
new file mode 100644
index 0000000..371f5a5
--- /dev/null
+++ b/exporting/prometheus/prometheus.c
@@ -0,0 +1,916 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#define EXPORTINGS_INTERNALS
+#include "prometheus.h"
+
+// ----------------------------------------------------------------------------
+// PROMETHEUS
+// /api/v1/allmetrics?format=prometheus and /api/v1/allmetrics?format=prometheus_all_hosts
+
+/**
+ * Check if a chart can be sent to Prometheus
+ *
+ * @param instance an instance data structure.
+ * @param st a chart.
+ * @return Returns 1 if the chart can be sent, 0 otherwise.
+ */
+inline int can_send_rrdset(struct instance *instance, RRDSET *st)
+{
+ RRDHOST *host = st->rrdhost;
+
+ if (unlikely(rrdset_flag_check(st, RRDSET_FLAG_BACKEND_IGNORE)))
+ return 0;
+
+ if (unlikely(!rrdset_flag_check(st, RRDSET_FLAG_BACKEND_SEND))) {
+ // we have not checked this chart
+ if (simple_pattern_matches(instance->config.charts_pattern, st->id) ||
+ simple_pattern_matches(instance->config.charts_pattern, st->name))
+ rrdset_flag_set(st, RRDSET_FLAG_BACKEND_SEND);
+ else {
+ rrdset_flag_set(st, RRDSET_FLAG_BACKEND_IGNORE);
+ debug(
+ D_BACKEND,
+ "EXPORTING: not sending chart '%s' of host '%s', because it is disabled for exporting.",
+ st->id,
+ host->hostname);
+ return 0;
+ }
+ }
+
+ if (unlikely(!rrdset_is_available_for_backends(st))) {
+ debug(
+ D_BACKEND,
+ "EXPORTING: not sending chart '%s' of host '%s', because it is not available for exporting.",
+ st->id,
+ host->hostname);
+ return 0;
+ }
+
+ if (unlikely(
+ st->rrd_memory_mode == RRD_MEMORY_MODE_NONE &&
+ !(EXPORTING_OPTIONS_DATA_SOURCE(instance->config.options) == EXPORTING_SOURCE_DATA_AS_COLLECTED))) {
+ debug(
+ D_BACKEND,
+ "EXPORTING: not sending chart '%s' of host '%s' because its memory mode is '%s' and the exporting connector requires database access.",
+ st->id,
+ host->hostname,
+ rrd_memory_mode_name(host->rrd_memory_mode));
+ return 0;
+ }
+
+ return 1;
+}
+
+static struct prometheus_server {
+ const char *server;
+ uint32_t hash;
+ RRDHOST *host;
+ time_t last_access;
+ struct prometheus_server *next;
+} *prometheus_server_root = NULL;
+
+static netdata_mutex_t prometheus_server_root_mutex = NETDATA_MUTEX_INITIALIZER;
+
+/**
+ * Clean server root local structure
+ */
+void prometheus_clean_server_root()
+{
+ if (prometheus_server_root) {
+ netdata_mutex_lock(&prometheus_server_root_mutex);
+
+ struct prometheus_server *ps;
+ for (ps = prometheus_server_root; ps; ) {
+ struct prometheus_server *current = ps;
+ ps = ps->next;
+ if(current->server)
+ freez((void *)current->server);
+
+ freez(current);
+ }
+ prometheus_server_root = NULL;
+ netdata_mutex_unlock(&prometheus_server_root_mutex);
+ }
+}
+
+/**
+ * Get the last time when a Prometheus server scraped the Netdata Prometheus exporter.
+ *
+ * @param server the name of the Prometheus server.
+ * @param host a data collecting host.
+ * @param now actual time.
+ * @return Returns the last time when the server accessed Netdata, or 0 if it is the first occurrence.
+ */
+static inline time_t prometheus_server_last_access(const char *server, RRDHOST *host, time_t now)
+{
+#ifdef UNIT_TESTING
+ return 0;
+#endif
+ uint32_t hash = simple_hash(server);
+
+ netdata_mutex_lock(&prometheus_server_root_mutex);
+
+ struct prometheus_server *ps;
+ for (ps = prometheus_server_root; ps; ps = ps->next) {
+ if (host == ps->host && hash == ps->hash && !strcmp(server, ps->server)) {
+ time_t last = ps->last_access;
+ ps->last_access = now;
+ netdata_mutex_unlock(&prometheus_server_root_mutex);
+ return last;
+ }
+ }
+
+ ps = callocz(1, sizeof(struct prometheus_server));
+ ps->server = strdupz(server);
+ ps->hash = hash;
+ ps->host = host;
+ ps->last_access = now;
+ ps->next = prometheus_server_root;
+ prometheus_server_root = ps;
+
+ netdata_mutex_unlock(&prometheus_server_root_mutex);
+ return 0;
+}
+
+/**
+ * Copy and sanitize name.
+ *
+ * @param d a destination string.
+ * @param s a source sting.
+ * @param usable the number of characters to copy.
+ * @return Returns the length of the copied string.
+ */
+inline size_t prometheus_name_copy(char *d, const char *s, size_t usable)
+{
+ size_t n;
+
+ for (n = 0; *s && n < usable; d++, s++, n++) {
+ register char c = *s;
+
+ if (!isalnum(c))
+ *d = '_';
+ else
+ *d = c;
+ }
+ *d = '\0';
+
+ return n;
+}
+
+/**
+ * Copy and sanitize label.
+ *
+ * @param d a destination string.
+ * @param s a source sting.
+ * @param usable the number of characters to copy.
+ * @return Returns the length of the copied string.
+ */
+inline size_t 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
+ usable--;
+
+ for (n = 0; *s && n < usable; d++, s++, n++) {
+ register char c = *s;
+
+ if (unlikely(c == '"' || c == '\\' || c == '\n')) {
+ *d++ = '\\';
+ n++;
+ }
+ *d = c;
+ }
+ *d = '\0';
+
+ return n;
+}
+
+/**
+ * Copy and sanitize units.
+ *
+ * @param d a destination string.
+ * @param s a source sting.
+ * @param usable the number of characters to copy.
+ * @param showoldunits set this flag to 1 to show old (before v1.12) units.
+ * @return Returns the destination string.
+ */
+inline char *prometheus_units_copy(char *d, const char *s, size_t usable, int showoldunits)
+{
+ const char *sorig = s;
+ char *ret = d;
+ size_t n;
+
+ // Fix for issue 5227
+ if (unlikely(showoldunits)) {
+ static struct {
+ const char *newunit;
+ uint32_t hash;
+ const char *oldunit;
+ } units[] = { { "KiB/s", 0, "kilobytes/s" },
+ { "MiB/s", 0, "MB/s" },
+ { "GiB/s", 0, "GB/s" },
+ { "KiB", 0, "KB" },
+ { "MiB", 0, "MB" },
+ { "GiB", 0, "GB" },
+ { "inodes", 0, "Inodes" },
+ { "percentage", 0, "percent" },
+ { "faults/s", 0, "page faults/s" },
+ { "KiB/operation", 0, "kilobytes per operation" },
+ { "milliseconds/operation", 0, "ms per operation" },
+ { NULL, 0, NULL } };
+ static int initialized = 0;
+ int i;
+
+ if (unlikely(!initialized)) {
+ for (i = 0; units[i].newunit; i++)
+ units[i].hash = simple_hash(units[i].newunit);
+ initialized = 1;
+ }
+
+ uint32_t hash = simple_hash(s);
+ for (i = 0; units[i].newunit; i++) {
+ if (unlikely(hash == units[i].hash && !strcmp(s, units[i].newunit))) {
+ // info("matched extension for filename '%s': '%s'", filename, last_dot);
+ s = units[i].oldunit;
+ sorig = s;
+ break;
+ }
+ }
+ }
+ *d++ = '_';
+ for (n = 1; *s && n < usable; d++, s++, n++) {
+ register char c = *s;
+
+ if (!isalnum(c))
+ *d = '_';
+ else
+ *d = c;
+ }
+
+ if (n == 2 && sorig[0] == '%') {
+ n = 0;
+ d = ret;
+ s = "_percent";
+ for (; *s && n < usable; n++)
+ *d++ = *s++;
+ } else if (n > 3 && sorig[n - 3] == '/' && sorig[n - 2] == 's') {
+ n = n - 2;
+ d -= 2;
+ s = "_persec";
+ for (; *s && n < usable; n++)
+ *d++ = *s++;
+ }
+
+ *d = '\0';
+
+ return ret;
+}
+
+/**
+ * Format host labels for the Prometheus exporter
+ *
+ * @param instance an instance data structure.
+ * @param host a data collecting host.
+ */
+void format_host_labels_prometheus(struct instance *instance, RRDHOST *host)
+{
+ if (unlikely(!sending_labels_configured(instance)))
+ return;
+
+ if (!instance->labels)
+ instance->labels = buffer_create(1024);
+
+ int count = 0;
+ rrdhost_check_rdlock(host);
+ netdata_rwlock_rdlock(&host->labels.labels_rwlock);
+ for (struct label *label = host->labels.head; label; label = label->next) {
+ if (!should_send_label(instance, label))
+ continue;
+
+ char key[PROMETHEUS_ELEMENT_MAX + 1];
+ char value[PROMETHEUS_ELEMENT_MAX + 1];
+
+ prometheus_name_copy(key, label->key, PROMETHEUS_ELEMENT_MAX);
+ prometheus_label_copy(value, label->value, PROMETHEUS_ELEMENT_MAX);
+
+ if (*key && *value) {
+ if (count > 0)
+ buffer_strcat(instance->labels, ",");
+ buffer_sprintf(instance->labels, "%s=\"%s\"", key, value);
+ count++;
+ }
+ }
+ netdata_rwlock_unlock(&host->labels.labels_rwlock);
+}
+
+struct host_variables_callback_options {
+ RRDHOST *host;
+ BUFFER *wb;
+ EXPORTING_OPTIONS exporting_options;
+ PROMETHEUS_OUTPUT_OPTIONS output_options;
+ const char *prefix;
+ const char *labels;
+ time_t now;
+ int host_header_printed;
+ char name[PROMETHEUS_VARIABLE_MAX + 1];
+};
+
+/**
+ * Print host variables.
+ *
+ * @param rv a variable.
+ * @param data callback options.
+ * @return Returns 1 if the chart can be sent, 0 otherwise.
+ */
+static int print_host_variables(RRDVAR *rv, void *data)
+{
+ struct host_variables_callback_options *opts = data;
+
+ if (rv->options & (RRDVAR_OPTION_CUSTOM_HOST_VAR | RRDVAR_OPTION_CUSTOM_CHART_VAR)) {
+ if (!opts->host_header_printed) {
+ opts->host_header_printed = 1;
+
+ if (opts->output_options & 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)
+ buffer_sprintf(
+ opts->wb, "# COMMENT variable \"%s\" is %s. Skipped.\n", rv->name, (isnan(value)) ? "NAN" : "INF");
+
+ return 0;
+ }
+
+ char *label_pre = "";
+ char *label_post = "";
+ if (opts->labels && *opts->labels) {
+ label_pre = "{";
+ label_post = "}";
+ }
+
+ prometheus_name_copy(opts->name, rv->name, sizeof(opts->name));
+
+ if (opts->output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
+ buffer_sprintf(
+ opts->wb,
+ "%s_%s%s%s%s " CALCULATED_NUMBER_FORMAT " %llu\n",
+ opts->prefix,
+ opts->name,
+ label_pre,
+ opts->labels,
+ label_post,
+ value,
+ opts->now * 1000ULL);
+ else
+ buffer_sprintf(
+ opts->wb,
+ "%s_%s%s%s%s " CALCULATED_NUMBER_FORMAT "\n",
+ opts->prefix,
+ opts->name,
+ label_pre,
+ opts->labels,
+ label_post,
+ value);
+
+ return 1;
+ }
+
+ return 0;
+}
+
+struct gen_parameters {
+ const char *prefix;
+ char *context;
+ char *suffix;
+
+ char *chart;
+ char *dimension;
+ char *family;
+ char *labels;
+
+ PROMETHEUS_OUTPUT_OPTIONS output_options;
+ RRDSET *st;
+ RRDDIM *rd;
+
+ const char *relation;
+ const char *type;
+};
+
+/**
+ * Write an as-collected help comment to a buffer.
+ *
+ * @param wb the buffer to write the comment to.
+ * @param p parameters for generating the comment string.
+ * @param homogeneous a flag for homogeneous charts.
+ * @param prometheus_collector a flag for metrics from prometheus collector.
+ */
+static void generate_as_collected_prom_help(BUFFER *wb, struct gen_parameters *p, int homogeneous, int prometheus_collector)
+{
+ buffer_sprintf(wb, "# COMMENT %s_%s", p->prefix, p->context);
+
+ if (!homogeneous)
+ buffer_sprintf(wb, "_%s", p->dimension);
+
+ buffer_sprintf(
+ wb,
+ "%s: chart \"%s\", context \"%s\", family \"%s\", dimension \"%s\", value * ",
+ p->suffix,
+ (p->output_options & PROMETHEUS_OUTPUT_NAMES && p->st->name) ? p->st->name : p->st->id,
+ p->st->context,
+ p->st->family,
+ (p->output_options & PROMETHEUS_OUTPUT_NAMES && p->rd->name) ? p->rd->name : p->rd->id);
+
+ if (prometheus_collector)
+ buffer_sprintf(wb, "1 / 1");
+ else
+ buffer_sprintf(wb, COLLECTED_NUMBER_FORMAT " / " COLLECTED_NUMBER_FORMAT, p->rd->multiplier, p->rd->divisor);
+
+ buffer_sprintf(wb, " %s %s (%s)\n", p->relation, p->st->units, p->type);
+}
+
+/**
+ * Write an as-collected metric to a buffer.
+ *
+ * @param wb the buffer to write the metric to.
+ * @param p parameters for generating the metric string.
+ * @param homogeneous a flag for homogeneous charts.
+ * @param prometheus_collector a flag for metrics from prometheus collector.
+ */
+static void generate_as_collected_prom_metric(BUFFER *wb, struct gen_parameters *p, int homogeneous, int prometheus_collector)
+{
+ buffer_sprintf(wb, "%s_%s", p->prefix, p->context);
+
+ if (!homogeneous)
+ buffer_sprintf(wb, "_%s", p->dimension);
+
+ buffer_sprintf(wb, "%s{chart=\"%s\",family=\"%s\"", p->suffix, p->chart, p->family);
+
+ if (homogeneous)
+ buffer_sprintf(wb, ",dimension=\"%s\"", p->dimension);
+
+ buffer_sprintf(wb, "%s} ", p->labels);
+
+ if (prometheus_collector)
+ buffer_sprintf(
+ wb,
+ CALCULATED_NUMBER_FORMAT,
+ (calculated_number)p->rd->last_collected_value * (calculated_number)p->rd->multiplier /
+ (calculated_number)p->rd->divisor);
+ else
+ buffer_sprintf(wb, COLLECTED_NUMBER_FORMAT, p->rd->last_collected_value);
+
+ if (p->output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
+ buffer_sprintf(wb, " %llu\n", timeval_msec(&p->rd->last_collected_time));
+ else
+ buffer_sprintf(wb, "\n");
+}
+
+/**
+ * Write metrics in Prometheus format to a buffer.
+ *
+ * @param instance an instance data structure.
+ * @param host a data collecting host.
+ * @param wb the buffer to fill with metrics.
+ * @param prefix a prefix for every metric.
+ * @param exporting_options options to configure what data is exported.
+ * @param allhosts set to 1 if host instance should be in the output for tags.
+ * @param output_options options to configure the format of the output.
+ */
+static void rrd_stats_api_v1_charts_allmetrics_prometheus(
+ struct instance *instance,
+ RRDHOST *host,
+ BUFFER *wb,
+ const char *prefix,
+ EXPORTING_OPTIONS exporting_options,
+ int allhosts,
+ PROMETHEUS_OUTPUT_OPTIONS output_options)
+{
+ rrdhost_rdlock(host);
+
+ char hostname[PROMETHEUS_ELEMENT_MAX + 1];
+ prometheus_label_copy(hostname, host->hostname, PROMETHEUS_ELEMENT_MAX);
+
+ format_host_labels_prometheus(instance, host);
+
+ if (output_options & 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);
+
+ char labels[PROMETHEUS_LABELS_MAX + 1] = "";
+ if (allhosts) {
+ if (instance->labels && buffer_tostring(instance->labels)) {
+ if (output_options & PROMETHEUS_OUTPUT_TIMESTAMPS) {
+ buffer_sprintf(
+ wb,
+ "netdata_host_tags_info{instance=\"%s\",%s} 1 %llu\n",
+ hostname,
+ buffer_tostring(instance->labels),
+ now_realtime_usec() / USEC_PER_MS);
+
+ // deprecated, exists only for compatibility with older queries
+ buffer_sprintf(
+ wb,
+ "netdata_host_tags{instance=\"%s\",%s} 1 %llu\n",
+ hostname,
+ buffer_tostring(instance->labels),
+ now_realtime_usec() / USEC_PER_MS);
+ } else {
+ buffer_sprintf(
+ wb, "netdata_host_tags_info{instance=\"%s\",%s} 1\n", hostname, buffer_tostring(instance->labels));
+
+ // deprecated, exists only for compatibility with older queries
+ buffer_sprintf(
+ wb, "netdata_host_tags{instance=\"%s\",%s} 1\n", hostname, buffer_tostring(instance->labels));
+ }
+ }
+
+ snprintfz(labels, PROMETHEUS_LABELS_MAX, ",instance=\"%s\"", hostname);
+ } else {
+ if (instance->labels && buffer_tostring(instance->labels)) {
+ if (output_options & PROMETHEUS_OUTPUT_TIMESTAMPS) {
+ buffer_sprintf(
+ wb,
+ "netdata_host_tags_info{%s} 1 %llu\n",
+ buffer_tostring(instance->labels),
+ now_realtime_usec() / USEC_PER_MS);
+
+ // deprecated, exists only for compatibility with older queries
+ buffer_sprintf(
+ wb,
+ "netdata_host_tags{%s} 1 %llu\n",
+ buffer_tostring(instance->labels),
+ now_realtime_usec() / USEC_PER_MS);
+ } else {
+ buffer_sprintf(wb, "netdata_host_tags_info{%s} 1\n", buffer_tostring(instance->labels));
+
+ // deprecated, exists only for compatibility with older queries
+ buffer_sprintf(wb, "netdata_host_tags{%s} 1\n", buffer_tostring(instance->labels));
+ }
+ }
+ }
+
+ if (instance->labels)
+ buffer_flush(instance->labels);
+
+ // send custom variables set for the host
+ if (output_options & PROMETHEUS_OUTPUT_VARIABLES) {
+ struct host_variables_callback_options opts = { .host = host,
+ .wb = wb,
+ .labels = (labels[0] == ',') ? &labels[1] : labels,
+ .exporting_options = exporting_options,
+ .output_options = output_options,
+ .prefix = prefix,
+ .now = now_realtime_sec(),
+ .host_header_printed = 0 };
+ foreach_host_variable_callback(host, print_host_variables, &opts);
+ }
+
+ // for each chart
+ RRDSET *st;
+ rrdset_foreach_read(st, host)
+ {
+
+ if (likely(can_send_rrdset(instance, st))) {
+ rrdset_rdlock(st);
+
+ char chart[PROMETHEUS_ELEMENT_MAX + 1];
+ char context[PROMETHEUS_ELEMENT_MAX + 1];
+ 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);
+
+ int as_collected = (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_AS_COLLECTED);
+ int homogeneous = 1;
+ int prometheus_collector = 0;
+ if (as_collected) {
+ if (rrdset_flag_check(st, RRDSET_FLAG_HOMOGENEOUS_CHECK))
+ rrdset_update_heterogeneous_flag(st);
+
+ if (rrdset_flag_check(st, RRDSET_FLAG_HETEROGENEOUS))
+ homogeneous = 0;
+
+ if (st->module_name && !strcmp(st->module_name, "prometheus"))
+ prometheus_collector = 1;
+ } else {
+ if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_AVERAGE &&
+ !(output_options & PROMETHEUS_OUTPUT_HIDEUNITS))
+ prometheus_units_copy(
+ units, st->units, PROMETHEUS_ELEMENT_MAX, output_options & PROMETHEUS_OUTPUT_OLDUNITS);
+ }
+
+ if (unlikely(output_options & 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,
+ st->context,
+ st->family,
+ st->units);
+
+ // for each dimension
+ RRDDIM *rd;
+ rrddim_foreach_read(rd, st)
+ {
+ if (rd->collections_counter && !rrddim_flag_check(rd, RRDDIM_FLAG_OBSOLETE)) {
+ char dimension[PROMETHEUS_ELEMENT_MAX + 1];
+ char *suffix = "";
+
+ if (as_collected) {
+ // we need as-collected / raw data
+
+ struct gen_parameters p;
+ p.prefix = prefix;
+ p.context = context;
+ p.suffix = suffix;
+ p.chart = chart;
+ p.dimension = dimension;
+ p.family = family;
+ p.labels = labels;
+ p.output_options = output_options;
+ p.st = st;
+ p.rd = rd;
+
+ if (unlikely(rd->last_collected_time.tv_sec < instance->after))
+ continue;
+
+ p.type = "gauge";
+ p.relation = "gives";
+ if (rd->algorithm == RRD_ALGORITHM_INCREMENTAL ||
+ rd->algorithm == RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL) {
+ p.type = "counter";
+ p.relation = "delta gives";
+ p.suffix = "_total";
+ }
+
+ if (homogeneous) {
+ // 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);
+
+ if (unlikely(output_options & PROMETHEUS_OUTPUT_HELP))
+ generate_as_collected_prom_help(wb, &p, homogeneous, prometheus_collector);
+
+ if (unlikely(output_options & PROMETHEUS_OUTPUT_TYPES))
+ buffer_sprintf(wb, "# TYPE %s_%s%s %s\n", prefix, context, suffix, p.type);
+
+ generate_as_collected_prom_metric(wb, &p, homogeneous, prometheus_collector);
+ } 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,
+ (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id,
+ PROMETHEUS_ELEMENT_MAX);
+
+ if (unlikely(output_options & PROMETHEUS_OUTPUT_HELP))
+ generate_as_collected_prom_help(wb, &p, homogeneous, prometheus_collector);
+
+ if (unlikely(output_options & PROMETHEUS_OUTPUT_TYPES))
+ buffer_sprintf(
+ wb, "# TYPE %s_%s_%s%s %s\n", prefix, context, dimension, suffix, p.type);
+
+ generate_as_collected_prom_metric(wb, &p, homogeneous, prometheus_collector);
+ }
+ } else {
+ // we need average or sum of the data
+
+ time_t first_time = instance->after;
+ time_t last_time = instance->before;
+ calculated_number value = exporting_calculate_value_from_stored_data(instance, rd, &last_time);
+
+ if (!isnan(value) && !isinf(value)) {
+ if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_AVERAGE)
+ suffix = "_average";
+ else if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_SUM)
+ suffix = "_sum";
+
+ prometheus_label_copy(
+ dimension,
+ (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id,
+ PROMETHEUS_ELEMENT_MAX);
+
+ if (unlikely(output_options & 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,
+ st->units,
+ (unsigned long long)first_time,
+ (unsigned long long)last_time);
+
+ if (unlikely(output_options & PROMETHEUS_OUTPUT_TYPES))
+ buffer_sprintf(wb, "# TYPE %s_%s%s%s gauge\n", prefix, context, units, suffix);
+
+ if (output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
+ buffer_sprintf(
+ wb,
+ "%s_%s%s%s{chart=\"%s\",family=\"%s\",dimension=\"%s\"%s} " CALCULATED_NUMBER_FORMAT
+ " %llu\n",
+ prefix,
+ context,
+ units,
+ suffix,
+ chart,
+ family,
+ dimension,
+ labels,
+ value,
+ last_time * MSEC_PER_SEC);
+ else
+ buffer_sprintf(
+ wb,
+ "%s_%s%s%s{chart=\"%s\",family=\"%s\",dimension=\"%s\"%s} " CALCULATED_NUMBER_FORMAT
+ "\n",
+ prefix,
+ context,
+ units,
+ suffix,
+ chart,
+ family,
+ dimension,
+ labels,
+ value);
+ }
+ }
+ }
+ }
+
+ rrdset_unlock(st);
+ }
+ }
+
+ rrdhost_unlock(host);
+}
+
+/**
+ * Get the last time time when a server accessed Netdata. Write information about an API request to a buffer.
+ *
+ * @param instance an instance data structure.
+ * @param host a data collecting host.
+ * @param wb the buffer to write to.
+ * @param exporting_options options to configure what data is exported.
+ * @param server the name of a Prometheus server..
+ * @param now actual time.
+ * @param output_options options to configure the format of the output.
+ * @return Returns the last time when the server accessed Netdata.
+ */
+static inline time_t prometheus_preparation(
+ struct instance *instance,
+ RRDHOST *host,
+ BUFFER *wb,
+ EXPORTING_OPTIONS exporting_options,
+ const char *server,
+ time_t now,
+ PROMETHEUS_OUTPUT_OPTIONS output_options)
+{
+ if (!server || !*server)
+ server = "default";
+
+ time_t after = prometheus_server_last_access(server, host, now);
+
+ int first_seen = 0;
+ if (!after) {
+ after = now - instance->config.update_every;
+ first_seen = 1;
+ }
+
+ if (after > now) {
+ // oops! this should never happen
+ after = now - instance->config.update_every;
+ }
+
+ if (output_options & PROMETHEUS_OUTPUT_HELP) {
+ char *mode;
+ if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_AS_COLLECTED)
+ mode = "as collected";
+ else if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_AVERAGE)
+ mode = "average";
+ else if (EXPORTING_OPTIONS_DATA_SOURCE(exporting_options) == EXPORTING_SOURCE_DATA_SUM)
+ mode = "sum";
+ else
+ mode = "unknown";
+
+ buffer_sprintf(
+ wb,
+ "# COMMENT netdata \"%s\" to %sprometheus \"%s\", source \"%s\", last seen %lu %s, time range %lu to %lu\n\n",
+ host->hostname,
+ (first_seen) ? "FIRST SEEN " : "",
+ server,
+ mode,
+ (unsigned long)((first_seen) ? 0 : (now - after)),
+ (first_seen) ? "never" : "seconds ago",
+ (unsigned long)after,
+ (unsigned long)now);
+ }
+
+ return after;
+}
+
+/**
+ * Write metrics and auxiliary information for one host to a buffer.
+ *
+ * @param host a data collecting host.
+ * @param wb the buffer to write to.
+ * @param server the name of a Prometheus server.
+ * @param prefix a prefix for every metric.
+ * @param exporting_options options to configure what data is exported.
+ * @param output_options options to configure the format of the output.
+ */
+void rrd_stats_api_v1_charts_allmetrics_prometheus_single_host(
+ RRDHOST *host,
+ BUFFER *wb,
+ const char *server,
+ const char *prefix,
+ EXPORTING_OPTIONS exporting_options,
+ PROMETHEUS_OUTPUT_OPTIONS output_options)
+{
+ if (unlikely(!prometheus_exporter_instance))
+ return;
+
+ prometheus_exporter_instance->before = now_realtime_sec();
+
+ // we start at the point we had stopped before
+ prometheus_exporter_instance->after = prometheus_preparation(
+ prometheus_exporter_instance,
+ host,
+ wb,
+ exporting_options,
+ server,
+ prometheus_exporter_instance->before,
+ output_options);
+
+ rrd_stats_api_v1_charts_allmetrics_prometheus(
+ prometheus_exporter_instance, host, wb, prefix, exporting_options, 0, output_options);
+}
+
+/**
+ * Write metrics and auxiliary information for all hosts to a buffer.
+ *
+ * @param host a data collecting host.
+ * @param wb the buffer to write to.
+ * @param server the name of a Prometheus server.
+ * @param prefix a prefix for every metric.
+ * @param exporting_options options to configure what data is exported.
+ * @param output_options options to configure the format of the output.
+ */
+void rrd_stats_api_v1_charts_allmetrics_prometheus_all_hosts(
+ RRDHOST *host,
+ BUFFER *wb,
+ const char *server,
+ const char *prefix,
+ EXPORTING_OPTIONS exporting_options,
+ PROMETHEUS_OUTPUT_OPTIONS output_options)
+{
+ if (unlikely(!prometheus_exporter_instance))
+ return;
+
+ prometheus_exporter_instance->before = now_realtime_sec();
+
+ // we start at the point we had stopped before
+ prometheus_exporter_instance->after = prometheus_preparation(
+ prometheus_exporter_instance,
+ host,
+ wb,
+ exporting_options,
+ server,
+ prometheus_exporter_instance->before,
+ output_options);
+
+ rrd_rdlock();
+ rrdhost_foreach_read(host)
+ {
+ rrd_stats_api_v1_charts_allmetrics_prometheus(
+ prometheus_exporter_instance, host, wb, prefix, exporting_options, 1, output_options);
+ }
+ rrd_unlock();
+}