Hi, here is what I read from
https://prometheus.io/docs/prometheus/latest/configuration/alerting_rules/ :
> For pending and firing alerts, Prometheus also stores synthetic time
series of the form ALERTS{alertname="<alert name>",
alertstate="pending|firing", <additional alert labels>}. The sample value
is set to 1 as long as the alert is in the indicated active (pending or
firing) state, and the series is marked stale when this is no longer the
case.
Can I ask what does stale mean?
Does it mean the series data is deleted from the database?
If not, can I query these stale data, and how can I mark a serie stale by
myself?
Is there more documents about `stale`?
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