johncming

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The issue is not caused by relabeling. You can check the WAL write status. Please check `prometheus_tsdb_wal_writes_failed_total`.

> The issue is not caused by relabeling. > > You can check the WAL write status. Please check `prometheus_tsdb_wal_writes_failed_total`. The possible reason is that the sample record is written...

> Ok, but still the behavior changed by upgrading from 0.21.0 (maybe 0.22.0 too?) to 0.23.0. The change is from 0.21 to 0.22. It's not recorded in CHANGELOG. https://github.com/prometheus/alertmanager/pull/2441