StorageGRID temporary reports Cassandra repair progress slow while reaper job

• NetApp StorageGRID 11.9
• No configuration changes has been performed
• The number of Reaper Segment of StorageGRID is stable
• The reaper job completes without significant delay

• Cassandra repair progress slow alert (CassandraRepairProgressSlow) is temporary reported then resolved within a few hours while reaper job
• SYSTEM-ALERTS.XML in AutoSupport indicates that the alert is triggered with almost 99% (0.99) of effectiveRepairPercent

• The result of spreaper list-runs command and/or reaper_commands.txt from gathered StorageGRID log indicates:
  • The state of the job is DONE
  • The duration of the job does not indicate significant delay compared to usual

      "creation_time": "2025-10-02T10:36:25Z",
      "current_time": "2025-10-03T06:25:23Z",
      "datacenters": [],
      "duration": "2 hours 59 minutes 22 seconds",
      "end_time": "2025-10-02T13:35:48Z",
      "estimated_time_of_arrival": "2025-10-03T06:25:23Z",
      "id": "a59eb1c0-9f7b-11f0-b7a4-f145df753831",
      "incremental_repair": false,
      "intensity": 1.0,
      "keyspace_name": "storagegrid",
      "last_event": "All done",
      "nodes": [],
      "owner": "storagegrid",
      "pause_time": null,
      "repair_parallelism": "PARALLEL",
      "repair_thread_count": 4,
      "repair_unit_id": "baa9d130-0d66-11ed-aa3d-7956199f8cc2",
      "segments_repaired": 977,
      "start_time": "2025-10-02T10:36:25Z",
      "state": "DONE",
      "total_segments": 977

• Reaper Segment State graph displayed by SUPPORT > Metrics > Cassandra Network Overview indicates that the number of storagegrid:DONE stays the same before and after the reaper job, except while the job is running