> If I understand correctly, prometheus doesn't send any "resolved"
> message to alertmanager: it just stops sending alerts. Alertmanager
> treats the lack of alert as meaning "resolved".
>
> Therefore, if you receive the "resolved" message, then this proves
> that alertmanager must have received the original alert.
>
> Hence you need to check the alertmanager logs to determine why it
> couldn't send out the original alert E-mail.
Modern versions of Prometheus do send specific 'resolved' messages to
Alertmanager when an alert ends. I don't know what Alertmanager does
if it receives a 'resolved' message for an alert that it hasn't seen
before, though.
If Prometheus stops periodically sending information about current
alerts to Alertmanager (for example because it's been stopped or has
crashed), the current alerts will normally time out in a few minutes and
be declared as resolved by Alertmanager. But normally this shouldn't
happen; Prometheus re-notifies Alertmanager about any current alerts
on a regular basis.
- cks
--
You received this message because you are subscribed to the Google Groups
"Prometheus Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/prometheus-users/20200218190718.AAC183201A1%40apps1.cs.toronto.edu.
