Hi,
I have multiple prometheus instances sending alerts to one alertmanager,
which deduplicates the alerts. To ensure alerting pipeline between each
prometheus and alertmanager is working properly, I want to send a always
active alert to the alertmanager. I am configuring a alert rule in each
prometheus which would always trigger. I have rule:
- alert: WatchDog
annotations:
message: 'This alert should always be active in alertmanager,
to ensure the prometheus-alertmanager integration is functional. We
should be notified immediately if this alert is not active'
expr: vector(1)
labels:
severity: none
The tricky part is how do we differentiate this alert in alertmanager,
since all prometheuses send the same alert. Is there a way to add labels
to a vector v before sending it to the alert manager. I saw prometheus
has alert_relabel_configs, but how do we use it to add labels to a
vector v has no labels ? Can I somehow use label_replace() or
label_join() functions for this use case?
Regards,
Sayan
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