I think this is intentional: https://github.com/prometheus/alertmanager/issues/996
I note that the API description says it deletes them: https://github.com/prometheus/alertmanager/blob/master/api/v2/openapi.yaml#L116-L117 - but maybe it ought to say that it expires them. -- 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/e2acb552-c1aa-4dc2-8654-a32b22b0019fn%40googlegroups.com.

