aho135 commented on code in PR #18598:
URL: https://github.com/apache/druid/pull/18598#discussion_r2411461694
##########
extensions-contrib/prometheus-emitter/src/main/java/org/apache/druid/emitter/prometheus/PrometheusEmitter.java:
##########
@@ -256,4 +279,21 @@ public void setPushGateway(PushGateway pushGateway)
{
this.pushGateway = pushGateway;
}
+
+ private void cleanUpStaleMetrics()
+ {
+ if (config.getFlushPeriod() == null) {
+ return;
+ }
+
+ Map<String, DimensionsAndCollector> map = metrics.getRegisteredMetrics();
+ for (Map.Entry<String, DimensionsAndCollector> entry : map.entrySet()) {
+ if (entry.getValue().isExpired(config.getFlushPeriod())) {
+ log.debug("Metric [%s] has expired (last updated %d ms ago)",
+ entry.getKey(),
+ entry.getValue().getTimeSinceLastUpdate());
+ entry.getValue().getCollector().clear();
Review Comment:
Yeah, I was also concerned about memory usage. Especially where folks are
adding queryId as a dimension like in #14638.
Sounds good to me to tackle the label problem in a separate PR. We can say
that this PR specifically targets resetting the metric value in the leader
election scenario
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