richardstartin commented on PR #8485:
URL: https://github.com/apache/pinot/pull/8485#issuecomment-1093114977

   I’ve measured the overhead of this manual instrumentation and it is within 
the noise when tracing is disabled.
   
   The will however augment default tracing, adding an entry per transform and 
projection block evaluated. Is this acceptable? Whenever I have tried to use 
existing tracing I have encountered ConcurrentModificationExceptions (still 
broken) as well as NullPointerExceptions (fixed recently) so I assume that 
nobody actually uses it. 


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