1. Local Storage Capacity Required disk size (GB) = data retention period _ samples fetched per second _ metric data size / 1024 / 1024 / 1024 Where Samples fetched per second: rate(prometheus_tsdb_head_samples_appended_total[1d]) Average size of a sample within one hour: rate(prometheus_tsdb_compaction_chunk_size_bytes_sum[1d])/rate(prometheus_tsdb_compaction_chunk_samples_sum[1d]) The disk consumption for one day (86400 seconds) can be queried directly in Prometheus: