itschrispeck opened a new pull request, #13307:
URL: https://github.com/apache/pinot/pull/13307

   Since the realtime Lucene index doesn't immediately make results available 
to searchers, this can cause confusion for users who see data, then search for 
it only to get no results. 
   
   This adds two gauges:
   ```
   LUCENE_INDEX_DELAY_MS
   LUCENE_INDEX_DELAY_DOCS
   ```
   These are per partition, and contain the value of the greatest delay across 
all columns. e.g., if you have two text indexes, on colA, and colB, if colA 
delay = 10s and colB delay = 20s, the gauge will emit 20s. 
   
   Tested in an internal cluster. 
   
   suggested tags: `enhancement`
   


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