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MINOR: contrib/prometheus-exporter: Add a param to ignore servers in maintenance

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By passing the parameter "no-maint" in the query-string, it is now possible to
ignore servers in maintenance. It means that the metrics for servers in this
state will not be exported.
This commit is contained in:
Christopher Faulet 2019-11-19 14:18:24 +01:00
parent 78407ce156
commit eba2294e5b
2 changed files with 17 additions and 0 deletions
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8
contrib/prometheus-exporter/README
View File

@ -73,6 +73,14 @@ exported. Here are examples:
/metrics?scope=*&scope= # ==> no metrics will be exported
/metrics?scope=&scope=global # ==> global metrics will be exported
* Filtering on servers state
It is possible to exclude from returned metrics all servers in maintenance mode
passing the parameter "no-maint" in the query-string. This parameter may help to
solve performance issues of configuration that use the server templates to
manage dynamic provisionning. Note there is no consistency check on the servers
state. So, if the state of a server changes while the exporter is running, only
a part of the metrics for this server will be dumped.
Exported metrics
------------------

9
contrib/prometheus-exporter/service-prometheus.c
View File

@ -68,6 +68,7 @@ enum {
#define PROMEX_FL_SCOPE_FRONT 0x00000010
#define PROMEX_FL_SCOPE_BACK 0x00000020
#define PROMEX_FL_SCOPE_SERVER 0x00000040
#define PROMEX_FL_NO_MAINT_SRV 0x00000080
#define PROMEX_FL_SCOPE_ALL (PROMEX_FL_SCOPE_GLOBAL|PROMEX_FL_SCOPE_FRONT|PROMEX_FL_SCOPE_BACK|PROMEX_FL_SCOPE_SERVER)
@ -1905,6 +1906,9 @@ static int promex_dump_srv_metrics(struct appctx *appctx, struct htx *htx)
while (appctx->ctx.stats.sv) {
sv = appctx->ctx.stats.sv;
if ((appctx->ctx.stats.flags & PROMEX_FL_NO_MAINT_SRV) && (sv->cur_admin & SRV_ADMF_MAINT))
goto next_sv;
switch (appctx->st2) {
case ST_F_STATUS:
metric = mkf_u32(FO_STATUS, promex_srv_status(sv));
@ -2075,6 +2079,7 @@ static int promex_dump_srv_metrics(struct appctx *appctx, struct htx *htx)
if (!promex_dump_metric(appctx, htx, prefix, &metric, &out, max))
goto full;
next_sv:
appctx->ctx.stats.sv = sv->next;
}
@ -2271,6 +2276,10 @@ static int promex_parse_uri(struct appctx *appctx, struct stream_interface *si)
p += len;
}
else if (*p == 'n' && (end-p) >= 8 && !memcmp(p, "no-maint", 8)) {
appctx->ctx.stats.flags |= PROMEX_FL_NO_MAINT_SRV;
p += 8;
}
else {
/* ignore all other params for now */
while (p < end && *p != '&')