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netdata/exporting/prometheus/prometheus.c

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// 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
static int is_matches_rrdset(struct instance *instance, RRDSET *st, SIMPLE_PATTERN *filter) {
if (instance->config.options & EXPORTING_OPTION_SEND_NAMES) {
return simple_pattern_matches(filter, rrdset_name(st));
}
return simple_pattern_matches(filter, rrdset_id(st));
}
/**
* Check if a chart can be sent to Prometheus
*
* @param instance an instance data structure.
* @param st a chart.
* @param filter a simple pattern to match against.
* @return Returns 1 if the chart can be sent, 0 otherwise.
*/
inline int can_send_rrdset(struct instance *instance, RRDSET *st, SIMPLE_PATTERN *filter)
{
#ifdef NETDATA_INTERNAL_CHECKS
RRDHOST *host = st->rrdhost;
#endif
// Do not send anomaly rates charts.
if (rrdset_is_ar_chart(st))
return 0;
if (unlikely(rrdset_flag_check(st, RRDSET_FLAG_EXPORTING_IGNORE)))
return 0;
if (filter) {
if (!is_matches_rrdset(instance, st, filter)) {
return 0;
}
} else if (unlikely(!rrdset_flag_check(st, RRDSET_FLAG_EXPORTING_SEND))) {
// we have not checked this chart
if (is_matches_rrdset(instance, st, instance->config.charts_pattern)) {
rrdset_flag_set(st, RRDSET_FLAG_EXPORTING_SEND);
} else {
rrdset_flag_set(st, RRDSET_FLAG_EXPORTING_IGNORE);
debug(
D_EXPORTING,
"EXPORTING: not sending chart '%s' of host '%s', because it is disabled for exporting.",
rrdset_id(st),
rrdhost_hostname(host));
return 0;
}
}
if (unlikely(!rrdset_is_available_for_exporting_and_alarms(st))) {
debug(
D_EXPORTING,
"EXPORTING: not sending chart '%s' of host '%s', because it is not available for exporting.",
rrdset_id(st),
rrdhost_hostname(host));
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_EXPORTING,
"EXPORTING: not sending chart '%s' of host '%s' because its memory mode is '%s' and the exporting connector requires database access.",
rrdset_id(st),
rrdhost_hostname(host),
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 string.
* @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 string.
* @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 string.
* @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.
*/
struct format_prometheus_label_callback {
struct instance *instance;
size_t count;
};
static int format_prometheus_label_callback(const char *name, const char *value, RRDLABEL_SRC ls, void *data) {
struct format_prometheus_label_callback *d = (struct format_prometheus_label_callback *)data;
if (!should_send_label(d->instance, ls)) return 0;
char k[PROMETHEUS_ELEMENT_MAX + 1];
char v[PROMETHEUS_ELEMENT_MAX + 1];
prometheus_name_copy(k, name, PROMETHEUS_ELEMENT_MAX);
prometheus_label_copy(v, value, PROMETHEUS_ELEMENT_MAX);
if (*k && *v) {
if (d->count > 0) buffer_strcat(d->instance->labels_buffer, ",");
buffer_sprintf(d->instance->labels_buffer, "%s=\"%s\"", k, v);
d->count++;
}
return 1;
}
void format_host_labels_prometheus(struct instance *instance, RRDHOST *host)
{
if (unlikely(!sending_labels_configured(instance)))
return;
if (!instance->labels_buffer)
instance->labels_buffer = buffer_create(1024);
struct format_prometheus_label_callback tmp = {
.instance = instance,
.count = 0
};
rrdlabels_walkthrough_read(host->rrdlabels, format_prometheus_label_callback, &tmp);
}
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_callback(const DICTIONARY_ITEM *item __maybe_unused, void *rv_ptr __maybe_unused, void *data) {
const RRDVAR_ACQUIRED *rv = (const RRDVAR_ACQUIRED *)item;
struct host_variables_callback_options *opts = data;
if (rrdvar_flags(rv) & (RRDVAR_FLAG_CUSTOM_HOST_VAR | RRDVAR_FLAG_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");
}
}
NETDATA_DOUBLE 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", rrdvar_name(rv), (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, rrdvar_name(rv), sizeof(opts->name));
if (opts->output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
buffer_sprintf(
opts->wb,
"%s_%s%s%s%s " NETDATA_DOUBLE_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 " NETDATA_DOUBLE_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) ? rrdset_name(p->st) : rrdset_id(p->st),
rrdset_context(p->st),
rrdset_family(p->st),
(p->output_options & PROMETHEUS_OUTPUT_NAMES && p->rd->name) ? rrddim_name(p->rd) : rrddim_id(p->rd));
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, rrdset_units(p->st), 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,
NETDATA_DOUBLE_FORMAT,
(NETDATA_DOUBLE)p->rd->last_collected_value * (NETDATA_DOUBLE)p->rd->multiplier /
(NETDATA_DOUBLE)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 filter_string a simple pattern filter.
* @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,
const char *filter_string,
BUFFER *wb,
const char *prefix,
EXPORTING_OPTIONS exporting_options,
int allhosts,
PROMETHEUS_OUTPUT_OPTIONS output_options)
{
SIMPLE_PATTERN *filter = simple_pattern_create(filter_string, NULL, SIMPLE_PATTERN_EXACT);
char hostname[PROMETHEUS_ELEMENT_MAX + 1];
prometheus_label_copy(hostname, rrdhost_hostname(host), PROMETHEUS_ELEMENT_MAX);
format_host_labels_prometheus(instance, host);
buffer_sprintf(
wb,
"netdata_info{instance=\"%s\",application=\"%s\",version=\"%s\"",
hostname,
rrdhost_program_name(host),
rrdhost_program_version(host));
if (instance->labels_buffer && *buffer_tostring(instance->labels_buffer)) {
buffer_sprintf(wb, ",%s", buffer_tostring(instance->labels_buffer));
}
if (output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
buffer_sprintf(wb, "} 1 %llu\n", now_realtime_usec() / USEC_PER_MS);
else
buffer_sprintf(wb, "} 1\n");
char labels[PROMETHEUS_LABELS_MAX + 1] = "";
if (allhosts) {
snprintfz(labels, PROMETHEUS_LABELS_MAX, ",instance=\"%s\"", hostname);
}
if (instance->labels_buffer)
buffer_flush(instance->labels_buffer);
// 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
};
rrdvar_walkthrough_read(host->rrdvars, print_host_variables_callback, &opts);
}
// for each chart
RRDSET *st;
rrdset_foreach_read(st, host) {
if (likely(can_send_rrdset(instance, st, filter))) {
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) ? rrdset_name(st) : rrdset_id(st), PROMETHEUS_ELEMENT_MAX);
prometheus_label_copy(family, rrdset_family(st), PROMETHEUS_ELEMENT_MAX);
prometheus_name_copy(context, rrdset_context(st), 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 (!strcmp(rrdset_module_name(st), "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, rrdset_units(st), 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) ? rrdset_name(st) : rrdset_id(st),
rrdset_context(st),
rrdset_family(st),
rrdset_units(st));
// 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";
if (!prometheus_collector)
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) ? rrddim_name(rd) : rrddim_id(rd),
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) ? rrddim_name(rd) : rrddim_id(rd),
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;
NETDATA_DOUBLE 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) ? rrddim_name(rd) : rrddim_id(rd),
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) ? rrddim_name(rd) : rrddim_id(rd),
rrdset_units(st),
(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} " NETDATA_DOUBLE_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} " NETDATA_DOUBLE_FORMAT
"\n",
prefix,
context,
units,
suffix,
chart,
family,
dimension,
labels,
value);
}
}
}
}
rrddim_foreach_done(rd);
}
}
rrdset_foreach_done(st);
simple_pattern_free(filter);
}
/**
* 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)
{
#ifndef UNIT_TESTING
analytics_log_prometheus();
#endif
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",
rrdhost_hostname(host),
(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 filter_string a simple pattern filter.
* @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,
const char *filter_string,
BUFFER *wb,
const char *server,
const char *prefix,
EXPORTING_OPTIONS exporting_options,
PROMETHEUS_OUTPUT_OPTIONS output_options)
{
if (unlikely(!prometheus_exporter_instance || !prometheus_exporter_instance->config.initialized))
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, filter_string, 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 filter_string a simple pattern filter.
* @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,
const char *filter_string,
BUFFER *wb,
const char *server,
const char *prefix,
EXPORTING_OPTIONS exporting_options,
PROMETHEUS_OUTPUT_OPTIONS output_options)
{
if (unlikely(!prometheus_exporter_instance || !prometheus_exporter_instance->config.initialized))
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, filter_string, wb, prefix, exporting_options, 1, output_options);
}
rrd_unlock();
}
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