vogievetsky commented on code in PR #14828:
URL: https://github.com/apache/druid/pull/14828#discussion_r1294934790


##########
docs/development/extensions-core/kafka-supervisor-reference.md:
##########
@@ -37,7 +37,7 @@ This topic contains configuration reference information for 
the Apache Kafka sup
 
 |Field|Type|Description|Required|
 |-----|----|-----------|--------|
-|`topic`|String|The Kafka topic to read from. Must be a specific topic. Topic 
patterns are not supported.|yes|
+|`topic`|String|The Kafka topic to read from. Must be a specific topic. Topic 
patterns are supported if `multiTopic` is enabled.|yes|

Review Comment:
   I think this should be restructured slightly to a form like this:
   
   ```
   If `multiTopic` is not set (or false) then `topic` is treated as a string 
that represents the Kafka topic from which the data will be read.
   If `multiTopic` is true then `topic` represents a regular expression that 
can match (exactly) several topics.
   ```
   
   One of the things I am not clear on (and want to see documentation for) is 
the `exactly` part.
   Is the topic regex anchored in the start and end?
   If I have topics like `metrics-stage`, `metrics-dev`, `metrics-prod` if 
multiTopic is true should topic be set to `metrics-` or `metrics-.*`  ?



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