Vamsi-klu commented on PR #18343:
URL: https://github.com/apache/pinot/pull/18343#issuecomment-4966078185

   Checked the ordering and it holds up: `updateSegmentMetrics` runs before the 
guarded `updateTableSizeMetrics` in `processTable`, and both branches that 
return early (`idealState == null` and `!idealState.isEnabled()`) add to 
`_tablesToSkipSizeAggregation` before the guard reads it. `preprocess` builds a 
fresh `Context` each cycle, so the skip set never leaks across runs. Keeping 
`_disabledTables` as the narrower set so `DISABLED_TABLE_COUNT` isn't inflated 
by tables with a null IdealState is the right call, and `nullIdealStateTest` 
asserting that gauge stays 0 locks it in. And since `removeMetricsForTable` 
already fires in both branches, skipping the size call won't leave a stale 
gauge behind. I'm good with this.
   


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