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* lib/promscrape/discovery/kubernetes: fix leaking api watcher goroutine which was polling k8s API had no execution control. This leaded to leaking goroutines during config reload. See: https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4850 Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com> * lib/promscrape/discovery/kubernetes: use reference counting for urlWatcher cleanup Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com> * lib/promscrape/discovery/kubernetes: remove waitgroup sync for goroutines polling API server This is unnecessary since context will is cancelled and new requests will not be sent. Also, using waitgroup will increase time required to perform reload which might result in missed scrapes. Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com> * lib/promscrape/discovery/kubernetes: clarify comment Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com> * Apply suggestions from code review * lib/promscrape/discovery/kubernetes: address review feedback Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com> --------- Signed-off-by: Zakhar Bessarab <z.bessarab@victoriametrics.com> Co-authored-by: Nikolay <nik@victoriametrics.com> |
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