# Important Metrics

+ `GC tasks` and `GC tasks duration`: Tasks executed in **`gc_worker`** per second and the tasks durations
  + **`total-gc`**: Each `"gc"` task `GCs` all keys for a region (compaction filter disabled)
  + **`skipped-gc/failed-gc`**: Skipped `"gc"` tasks and failed `"gc"` tasks
  + **`total-unsfe_destroy_range`**: **`UnsafeDestroyRange`** task (invoked in `Delete Ranges phase`)
  + **`total-orphan_versions/total-gc_keys`**: Tasks issued by the compaction filter

![`smart`](GCImportantMetrics_aa_001_20221026.png)

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