Tip: Useful metrics How many times vmstorage failed to find a metric in the cache: vm_slow_row_inserts_total . The metric name and each label in the metrics (e.g., code="200" , path="/" ) also have their own entries mapped to the metric ID. To understand how vmstorage works in the background to persist data, see How vmstorage Processes Data: Retention, Merging, Deduplication,….