LakshSingla commented on code in PR #16342:
URL: https://github.com/apache/druid/pull/16342#discussion_r1584136923


##########
docs/operations/metrics.md:
##########
@@ -61,6 +61,7 @@ Most metric values reset each emission period, as specified 
in `druid.monitoring
 |`query/success/count`|Number of queries successfully processed.|This metric 
is only available if the `QueryCountStatsMonitor` module is included.| |
 |`query/failed/count`|Number of failed queries.|This metric is only available 
if the `QueryCountStatsMonitor` module is included.| |
 |`query/interrupted/count`|Number of queries interrupted due to 
cancellation.|This metric is only available if the `QueryCountStatsMonitor` 
module is included.| |
+|`query/merge/buffersUsed`|number of merge buffers allocated to broker while 
performing groupBy merge queries.|This metric is only available if the 
`QueryCountStatsMonitor` module is included.| |

Review Comment:
   This shouldn't be "allocated to broker". As per my perception, allocated to 
the broker means the total number of merge buffers present there. Also, there 
is no such thing as "groupBy merge query". 
   ```suggestion
   |`query/merge/buffersUsed`|Number of merge buffers used up to merge the 
results of group by queries.|This metric is only available if the 
`QueryCountStatsMonitor` module is included.| |
   ```



##########
processing/src/test/java/org/apache/druid/query/TestBufferPool.java:
##########
@@ -147,4 +147,10 @@ public Collection<RuntimeException> 
getOutstandingExceptionsCreated()
   {
     return takenFromMap.values();
   }
+
+  @Override
+  public int getUsedBufferCount()
+  {
+    return Integer.MAX_VALUE;
+  }

Review Comment:
   We can probably have the correct implementation for this class, even if it 
is a test utility. 



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