*"Alert relabeling ... has the same configuration format and actions as
target relabeling."*
That configuration is shown immediately above:
https://prometheus.io/docs/prometheus/latest/configuration/configuration/#relabel_config
You would need the "labeldrop" action.
alert_relabel_configs:
- regex: 'exported_namespace|exported_container'
action: labeldrop
There is also "labelkeep" which drops all labels *except* the given
pattern. However, you said "I only want the summary and description", but
those are not labels - they are annotations. You REALLY REALLY don't want
to drop all labels. For one thing, alertmanager uses the labels to
distinguish between one alert and another. You really don't want alert B
going away to resolve alert A.
It sounds to me that what you really want is to change the alertmanager
template to simplify the E-mails it sends out - NOT to remove the labels
sent from prometheus to alertmanager.
Google "prometheus alertmanager templates" for lots of examples how to do
that. Here's one hit:
https://prometheus.io/blog/2016/03/03/custom-alertmanager-templates/
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