Alertmanager flushing alerts

[arunkumar-sdworx]

alertmanager which was working fine until last month.but recently it seems flusing the alerts immedialy. what should i do to investigate this .

the debug logs in alertmanager are below

ts=2024-07-02T08:01:30.667Z caller=dispatch.go:164 level=debug component=dispatcher msg="Received alert" alert=api_performance_degradation_5[1f47c7b][active]
ts=2024-07-02T08:01:30.667Z caller=dispatch.go:164 level=debug component=dispatcher msg="Received alert" alert=api_performance_degradation_5[3c55bfd][active]
ts=2024-07-02T08:01:30.668Z caller=dispatch.go:516 level=debug component=dispatcher aggrGroup="{}:{alertname="api_performance_degradation_5"}" msg=flushing alerts="[api_performance_degradation_5[3c55bfd][active] api_performance_degradation_5[1f47c7b][active]]"

the configuration for alertmanager

group_by: ["alertname"]
group_interval: 5m
repeat_interval: 3h
group_wait: 60s
receiver: blackhole

receivers:

• name: "blackhole"

[grobinson-grafana]

Alertmanager will do an immediate flush following a restart if a flush should have happened in the past (see https://github.com/prometheus/alertmanager/blob/main/dispatch/dispatch.go#L493).

[arunkumar-sdworx]

@grobinson-grafana Thanks !
After some debug i found there was some time difference between in our alerting manager container which runs in a different docker swarm. after adjusting the time it started working fine