06Prometheus memory jumped 400% overnight. Find the cause and stop it recurring.▼hard★ EssentialDatadogUberGrafana Labs2 notes & commentsunlockedThe observability failure that scales with your success. Cardinality is the cost driver in every metrics system, and the fix has to be structural or it comes back next quarter.Open full answer →
13How does Prometheus actually store time series? Walk me through the WAL, blocks, compaction and retention.▼hardDatadogCloudflareGitLabunlockedThe pull model is the famous part and explains none of the operational pain. The storage engine is where Prometheus hurts in production: crash recovery, cold queries, disk death.Open full answer →
