PrometheusTSDBReloadsFailing #

Meaning #

Prometheus has issues reloading blocks from disk.

Impact #

Metrics and alerts may be missing or inaccurate.

Diagnosis #

Check storage used by the pod.

Mitigation #

Increase Prometheus pod memory so that it caches more from disk. Try expanding volumes if they are too small or too slow. Change PVC storageClass to a more performant one.