Nikolay 773b8b0b28 lib/storage: add tracker for time series metric names statistics ... This feature allows to track query requests by metric names. Tracker state is stored in-memory, capped by 1/100 of allocated memory to the storage. If cap exceeds, tracker rejects any new items add and instead registers query requests for already observed metric names. This feature is disable by default and new flag: `-storage.trackMetricNamesStats` enables it. New API added to the select component: * /api/v1/status/metric_names_stats - which returns a JSON object with usage statistics. * /admin/api/v1/status/metric_names_stats/reset - which resets internal state of the tracker and reset tsid/cache. New metrics were added for this feature: * vm_cache_size_bytes{type="storage/metricNamesUsageTracker"} * vm_cache_size{type="storage/metricNamesUsageTracker"} * vm_cache_size_max_bytes{type="storage/metricNamesUsageTracker"} Related issue: https://github.com/VictoriaMetrics/VictoriaMetrics/issues/4458 --------- Signed-off-by: f41gh7 <nik@victoriametrics.com> Co-authored-by: Roman Khavronenko <roman@victoriametrics.com>		2025-03-06 22:10:41 +01:00
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vmselect.go	lib/storage: add tracker for time series metric names statistics	2025-03-06 22:10:41 +01:00