Hey,
Having an interesting issue with Prom and Alert manager, im 99% sure its a
config issue, but having a hard time figuring it out.
We have a group of polls that use the blackbox exporter to ping some
endpoints. It pings once every 30 seconds.
The rule looks like this
- name: blackbox.rules.icmpFailed
rules:
- alert: BlackboxIcmpFailed
expr: probe_icmp_duration_seconds == 0
for: 5m
labels:
severity: critical
annotations:
summary: Ping to Device Failed.
And our alert manager config look like this
spec:
route:
groupBy: [ 'instance','severity' ]
groupWait: 30s
groupInterval: 5m
repeatInterval: 12h
Now here is what I am seeing.
If we have a single ping failure then an alert message is sent to slack,
which immediately clears on the next 5 min cycle.
I thought having the "for: 5m" should mean that an alert is ONLY sent if
that condition has been seen for 5 mins consecutively. As you can imagine
this leads to lots of angst :D
Any ideas?
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