gianm commented on a change in pull request #5541: Added merge/buffer metric to 
print buffer pool size every minute
URL: https://github.com/apache/incubator-druid/pull/5541#discussion_r237025261
 
 

 ##########
 File path: docs/content/operations/metrics.md
 ##########
 @@ -37,6 +37,7 @@ Available Metrics
 |`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 
or timeout|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|||
 
 Review comment:
   @kaijianding is right - it should be documented in those other sections as 
well.

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