gortiz opened a new pull request, #8884:
URL: https://github.com/apache/pinot/pull/8884

   This PR adds three new metrics that break down the older (and still 
supported) `numSegmentsPrunedByServer`.
   
   The three metrics are:
   - `numSegmentsPrunedInvalid`: Which include both segments that have been 
pruned because they are actually invalid (aka having docs) or their physical 
schema doesn't contain all the required columns (quite common when a new column 
is added but segments were not reloaded)
   - `numSegmentsPrunedByLimit`: The ones pruned by 
SelectionQuerySegmentPruner, for example: `select * from Table limit 10`
   - `numSegmentsPrunedByValue`: The ones pruned by ColumnValueSegmentPruner, 
for example when segments can be pruned by using bloom filters or max/min of 
each column.
   
   These metrics are shown when the controller is used. It may also be 
interesting to add a warning in the controller when `numSegmentsPrunedInvalid` 
is different than 0.


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