pd: add more region health info (#17449) (#17455)

pingcap · May 9, 2024 · f3562a9 · f3562a9
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diff --git a/daily-check.md b/daily-check.md
@@ -37,12 +37,15 @@ You can locate the slow SQL statement executed in the cluster. Then you can opti
 
 ![Region panel](/media/region-panel.png)
 
-+ `miss-peer-region-count`: The number of Regions without enough replicas. This value is not always greater than `0`.
++ `down-peer-region-count`: The number of Regions with an unresponsive peer reported by the Raft leader.
++ `empty-region-count`: The number of empty Regions, with a size of smaller than 1 MiB. These Regions are generated by executing the `TRUNCATE TABLE`/`DROP TABLE` statement. If this number is large, you can consider enabling `Region Merge` to merge Regions across tables.
 + `extra-peer-region-count`: The number of Regions with extra replicas. These Regions are generated during the scheduling process.
-+ `empty-region-count`: The number of empty Regions, generated by executing the `TRUNCATE TABLE`/`DROP TABLE` statement. If this number is large, you can consider enabling `Region Merge` to merge Regions across tables.
++ `learner-peer-region-count`: The number of Regions with the learner peer. The sources of learner peers can be various, for example, the learner peers in TiFlash, and the learner peers included in the configured Placement Rules.
++ `miss-peer-region-count`: The number of Regions without enough replicas. This value is not always greater than `0`.
++ `offline-peer-region-count`: The number of Regions during the peer offline process.
++ `oversized-region-count`: The number of Regions with a size larger than `region-max-size` or `region-max-keys`.
 + `pending-peer-region-count`: The number of Regions with outdated Raft logs. It is normal that a few pending peers are generated in the scheduling process. However, it is not normal if this value is large for a period of time (longer than 30 minutes).
-+ `down-peer-region-count`: The number of Regions with an unresponsive peer reported by the Raft leader.
-+ `offline-peer-region-count`: The number of Regions during the offline process.
++ `undersized-region-count`: The number of Regions with a size smaller than `max-merge-region-size` or `max-merge-region-keys`.
 
 Generally, it is normal that these values are not `0`. However, it is not normal that they are not `0` for quite a long time.
 

diff --git a/media/region-panel.png b/media/region-panel.png