OurNewestMember opened a new issue #11604:
URL: https://github.com/apache/druid/issues/11604


   ### Description
   
   Current indexing logic emits a log message, "rollup is enabled for 
datasource [xxx] but no metricsSpec has been provided", which may be 
misleading.  In the Java code (see following), emitting this log warning indeed 
depends upon the ingestion spec specifying rollup but does not depend upon 
whether "metricsSpec" was in fact provided.  This discrepancy between the text 
of the log message and the conditional logic may cause a user to believe 
incorrect information about the actual ingest spec submitted.
   
   
https://github.com/apache/druid/blob/c3faa24f269ad2e8fb7102255cb3738dd01e0536/server/src/main/java/org/apache/druid/segment/indexing/DataSchema.java#L117-L124
   
   ### Motivation
   
   Prevent adverse impacts occurring due to log noise.
   


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