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backend_prometheus.c
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backend_prometheus.c
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// SPDX-License-Identifier: GPL-3.0-or-later
#define BACKENDS_INTERNALS
#include "backend_prometheus.h"
// ----------------------------------------------------------------------------
// PROMETHEUS
// /api/v1/allmetrics?format=prometheus and /api/v1/allmetrics?format=prometheus_all_hosts
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 inline time_t prometheus_server_last_access(const char *server, RRDHOST *host, time_t now) {
static netdata_mutex_t prometheus_server_root_mutex = NETDATA_MUTEX_INITIALIZER;
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;
}
static 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;
}
static 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;
}
static inline char *prometheus_units_copy(char *d, const char *s, size_t usable) {
const char *sorig = s;
char *ret = d;
size_t n;
*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;
}
#define PROMETHEUS_ELEMENT_MAX 256
#define PROMETHEUS_LABELS_MAX 1024
#define PROMETHEUS_VARIABLE_MAX 256
struct host_variables_callback_options {
RRDHOST *host;
BUFFER *wb;
BACKEND_OPTIONS backend_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];
};
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
, ((rv->last_updated) ? rv->last_updated : 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;
}
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) {
rrdhost_rdlock(host);
char hostname[PROMETHEUS_ELEMENT_MAX + 1];
prometheus_label_copy(hostname, host->hostname, PROMETHEUS_ELEMENT_MAX);
char labels[PROMETHEUS_LABELS_MAX + 1] = "";
if(allhosts) {
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);
if(host->tags && *(host->tags)) {
if(output_options & 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
buffer_sprintf(wb, "netdata_host_tags{instance=\"%s\",%s} 1 %llu\n", hostname, host->tags, now_realtime_usec() / USEC_PER_MS);
}
else {
buffer_sprintf(wb, "netdata_host_tags_info{instance=\"%s\",%s} 1\n", hostname, host->tags);
// deprecated, exists only for compatibility with older queries
buffer_sprintf(wb, "netdata_host_tags{instance=\"%s\",%s} 1\n", hostname, host->tags);
}
}
snprintfz(labels, PROMETHEUS_LABELS_MAX, ",instance=\"%s\"", hostname);
}
else {
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);
if(host->tags && *(host->tags)) {
if(output_options & 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
buffer_sprintf(wb, "netdata_host_tags{%s} 1 %llu\n", host->tags, now_realtime_usec() / USEC_PER_MS);
}
else {
buffer_sprintf(wb, "netdata_host_tags_info{%s} 1\n", host->tags);
// deprecated, exists only for compatibility with older queries
buffer_sprintf(wb, "netdata_host_tags{%s} 1\n", host->tags);
}
}
}
// 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,
.backend_options = backend_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) {
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);
if(likely(backends_can_send_rrdset(backend_options, st))) {
rrdset_rdlock(st);
int as_collected = (BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED);
int homogeneus = 1;
if(as_collected) {
if(rrdset_flag_check(st, RRDSET_FLAG_HOMEGENEOUS_CHECK))
rrdset_update_heterogeneous_flag(st);
if(rrdset_flag_check(st, RRDSET_FLAG_HETEROGENEOUS))
homogeneus = 0;
}
else {
if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AVERAGE)
prometheus_units_copy(units, st->units, PROMETHEUS_ELEMENT_MAX);
}
if(unlikely(output_options & PROMETHEUS_OUTPUT_HELP))
buffer_sprintf(wb, "\n# COMMENT %s chart \"%s\", context \"%s\", family \"%s\", units \"%s\"\n"
, (homogeneus)?"homogeneus":"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
if(unlikely(rd->last_collected_time.tv_sec < after))
continue;
const char *t = "gauge", *h = "gives";
if(rd->algorithm == RRD_ALGORITHM_INCREMENTAL ||
rd->algorithm == RRD_ALGORITHM_PCENT_OVER_DIFF_TOTAL) {
t = "counter";
h = "delta gives";
suffix = "_total";
}
if(homogeneus) {
// 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))
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
, st->context
, st->family
, (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id
, rd->multiplier
, rd->divisor
, h
, st->units
, t
);
if(unlikely(output_options & PROMETHEUS_OUTPUT_TYPES))
buffer_sprintf(wb, "# COMMENT TYPE %s_%s%s %s\n"
, prefix
, context
, suffix
, t
);
if(output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
buffer_sprintf(wb
, "%s_%s%s{chart=\"%s\",family=\"%s\",dimension=\"%s\"%s} " COLLECTED_NUMBER_FORMAT " %llu\n"
, prefix
, context
, suffix
, chart
, family
, dimension
, labels
, rd->last_collected_value
, timeval_msec(&rd->last_collected_time)
);
else
buffer_sprintf(wb
, "%s_%s%s{chart=\"%s\",family=\"%s\",dimension=\"%s\"%s} " COLLECTED_NUMBER_FORMAT "\n"
, prefix
, context
, suffix
, chart
, family
, dimension
, labels
, rd->last_collected_value
);
}
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))
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
, st->context
, st->family
, (output_options & PROMETHEUS_OUTPUT_NAMES && rd->name) ? rd->name : rd->id
, rd->multiplier
, rd->divisor
, h
, st->units
, t
);
if(unlikely(output_options & PROMETHEUS_OUTPUT_TYPES))
buffer_sprintf(wb, "# COMMENT TYPE %s_%s_%s%s %s\n"
, prefix
, context
, dimension
, suffix
, t
);
if(output_options & PROMETHEUS_OUTPUT_TIMESTAMPS)
buffer_sprintf(wb
, "%s_%s_%s%s{chart=\"%s\",family=\"%s\"%s} " COLLECTED_NUMBER_FORMAT " %llu\n"
, prefix
, context
, dimension
, suffix
, chart
, family
, labels
, rd->last_collected_value
, timeval_msec(&rd->last_collected_time)
);
else
buffer_sprintf(wb
, "%s_%s_%s%s{chart=\"%s\",family=\"%s\"%s} " COLLECTED_NUMBER_FORMAT "\n"
, prefix
, context
, dimension
, suffix
, chart
, family
, labels
, rd->last_collected_value
);
}
}
else {
// we need average or sum of the data
time_t first_t = after, last_t = before;
calculated_number value = backend_calculate_value_from_stored_data(st, rd, after, before, backend_options, &first_t, &last_t);
if(!isnan(value) && !isinf(value)) {
if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AVERAGE)
suffix = "_average";
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);
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_t
, (unsigned long long)last_t
);
if (unlikely(output_options & PROMETHEUS_OUTPUT_TYPES))
buffer_sprintf(wb, "# COMMENT 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_t * 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);
}
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) {
if(!server || !*server) server = "default";
time_t after = prometheus_server_last_access(server, host, now);
int first_seen = 0;
if(!after) {
after = now - global_backend_update_every;
first_seen = 1;
}
if(after > now) {
// oops! this should never happen
after = now - global_backend_update_every;
}
if(output_options & PROMETHEUS_OUTPUT_HELP) {
char *mode;
if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AS_COLLECTED)
mode = "as collected";
else if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_SOURCE_DATA_AVERAGE)
mode = "average";
else if(BACKEND_OPTIONS_DATA_SOURCE(backend_options) == BACKEND_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;
}
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) {
time_t before = now_realtime_sec();
// we start at the point we had stopped before
time_t after = prometheus_preparation(host, wb, backend_options, server, before, output_options);
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) {
time_t before = now_realtime_sec();
// we start at the point we had stopped before
time_t after = prometheus_preparation(host, wb, backend_options, server, before, output_options);
rrd_rdlock();
rrdhost_foreach_read(host) {
rrd_stats_api_v1_charts_allmetrics_prometheus(host, wb, prefix, backend_options, after, before, 1, output_options);
}
rrd_unlock();
}