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MINOR: contrib/prometheus-exporter: report the number of idle conns per server 

This adds two extra metrics per server, one for the current number of idle
connections and one for the configured limit :

 * haproxy_server_idle_connections_current
 * haproxy_server_idle_connections_limit
This commit is contained in:
Christopher Faulet 2019-11-08 15:24:32 +01:00
parent 68b6968ecd
commit 20ab80c0c0
2 changed files with 21 additions and 1 deletions
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2
contrib/prometheus-exporter/README
View File

@ -243,4 +243,6 @@ Exported metrics
| haproxy_server_current_throttle | Current throttle percentage for the server, when slowstart is active. |
| haproxy_server_loadbalanced_total | Total number of times a service was selected. |
| haproxy_server_http_responses_total | Total number of HTTP responses. |
| haproxy_server_idle_connections_current | Current number of idle connections available for reuse. |
| haproxy_server_idle_connections_limit | Limit on the number of available idle connections. |
+----------------------------------------------------+---------------------------------------------------------------------------+

20
contrib/prometheus-exporter/service-prometheus.c
View File

@ -232,6 +232,8 @@ const int promex_front_metrics[ST_F_TOTAL_FIELDS] = {
[ST_F_REUSE] = 0,
[ST_F_CACHE_LOOKUPS] = ST_F_CACHE_HITS,
[ST_F_CACHE_HITS] = ST_F_COMP_IN,
[ST_F_SRV_ICUR] = 0,
[ST_F_SRV_ILIM] = 0,
[ST_F_QT_MAX] = 0,
[ST_F_CT_MAX] = 0,
[ST_F_RT_MAX] = 0,
@ -329,6 +331,8 @@ const int promex_back_metrics[ST_F_TOTAL_FIELDS] = {
[ST_F_REUSE] = ST_F_BIN,
[ST_F_CACHE_LOOKUPS] = ST_F_CACHE_HITS,
[ST_F_CACHE_HITS] = ST_F_COMP_IN,
[ST_F_SRV_ICUR] = 0,
[ST_F_SRV_ILIM] = 0,
[ST_F_QT_MAX] = ST_F_CT_MAX,
[ST_F_CT_MAX] = ST_F_RT_MAX,
[ST_F_RT_MAX] = ST_F_TT_MAX,
@ -382,7 +386,7 @@ const int promex_srv_metrics[ST_F_TOTAL_FIELDS] = {
[ST_F_HRSP_3XX] = ST_F_HRSP_4XX,
[ST_F_HRSP_4XX] = ST_F_HRSP_5XX,
[ST_F_HRSP_5XX] = ST_F_HRSP_OTHER,
[ST_F_HRSP_OTHER] = 0,
[ST_F_HRSP_OTHER] = ST_F_SRV_ICUR,
[ST_F_HANAFAIL] = 0,
[ST_F_REQ_RATE] = 0,
[ST_F_REQ_RATE_MAX] = 0,
@ -426,6 +430,8 @@ const int promex_srv_metrics[ST_F_TOTAL_FIELDS] = {
[ST_F_REUSE] = ST_F_DRESP,
[ST_F_CACHE_LOOKUPS] = 0,
[ST_F_CACHE_HITS] = 0,
[ST_F_SRV_ICUR] = ST_F_SRV_ILIM,
[ST_F_SRV_ILIM] = 0,
[ST_F_QT_MAX] = ST_F_CT_MAX,
[ST_F_CT_MAX] = ST_F_RT_MAX,
[ST_F_RT_MAX] = ST_F_TT_MAX,
@ -586,6 +592,8 @@ const struct ist promex_st_metric_names[ST_F_TOTAL_FIELDS] = {
[ST_F_REUSE] = IST("connection_reuses_total"),
[ST_F_CACHE_LOOKUPS] = IST("http_cache_lookups_total"),
[ST_F_CACHE_HITS] = IST("http_cache_hits_total"),
[ST_F_SRV_ICUR] = IST("server_idle_connections_current"),
[ST_F_SRV_ILIM] = IST("server_idle_connections_limit"),
[ST_F_QT_MAX] = IST("max_queue_time_seconds"),
[ST_F_CT_MAX] = IST("max_connect_time_seconds"),
[ST_F_RT_MAX] = IST("max_response_time_seconds"),
@ -746,6 +754,8 @@ const struct ist promex_st_metric_desc[ST_F_TOTAL_FIELDS] = {
[ST_F_REUSE] = IST("Total number of connection reuses."),
[ST_F_CACHE_LOOKUPS] = IST("Total number of HTTP cache lookups."),
[ST_F_CACHE_HITS] = IST("Total number of HTTP cache hits."),
[ST_F_SRV_ICUR] = IST("Current number of idle connections available for reuse"),
[ST_F_SRV_ILIM] = IST("Limit on the number of available idle connections"),
[ST_F_QT_MAX] = IST("Maximum observed time spent in the queue"),
[ST_F_CT_MAX] = IST("Maximum observed time spent waiting for a connection to complete"),
[ST_F_RT_MAX] = IST("Maximum observed time spent waiting for a server response"),
@ -1062,6 +1072,8 @@ const struct ist promex_st_metric_types[ST_F_TOTAL_FIELDS] = {
[ST_F_REUSE] = IST("counter"),
[ST_F_CACHE_LOOKUPS] = IST("counter"),
[ST_F_CACHE_HITS] = IST("counter"),
[ST_F_SRV_ICUR] = IST("gauge"),
[ST_F_SRV_ILIM] = IST("gauge"),
[ST_F_QT_MAX] = IST("gauge"),
[ST_F_CT_MAX] = IST("gauge"),
[ST_F_RT_MAX] = IST("gauge"),
@ -2043,6 +2055,12 @@ static int promex_dump_srv_metrics(struct appctx *appctx, struct htx *htx)
appctx->ctx.stats.flags &= ~PROMEX_FL_METRIC_HDR;
metric = mkf_u64(FN_COUNTER, sv->counters.p.http.rsp[0]);
break;
case ST_F_SRV_ICUR:
metric = mkf_u32(0, sv->curr_idle_conns);
break;
case ST_F_SRV_ILIM:
metric = mkf_u32(FO_CONFIG|FN_LIMIT, (sv->max_idle_conns == -1) ? 0 : sv->max_idle_conns);
break;
default:
goto next_metric;