kfaraz commented on code in PR #15817:
URL: https://github.com/apache/druid/pull/15817#discussion_r1578019275


##########
docs/operations/metrics.md:
##########
@@ -75,6 +75,12 @@ Most metric values reset each emission period, as specified 
in `druid.monitoring
 |`metadatacache/schemaPoll/count`|Number of coordinator polls to fetch 
datasource schema.||
 |`metadatacache/schemaPoll/failed`|Number of failed coordinator polls to fetch 
datasource schema.||
 |`metadatacache/schemaPoll/time`|Time taken for coordinator polls to fetch 
datasource schema.||
+|`metadatacache/backfill/count`|Number of segments for which schema was back 
filled in the database.|`dataSource`|
+|`schemacache/realtime/count`|Number of realtime segments for which schema is 
cached.||Depends on the number of realtime segments.|

Review Comment:
   **For follow-up PR**
   Do these rows render correctly? The preceding rows have only 3 columns, this 
one seems to have 4.



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