The logs for the QueryAnalysis{Sampler,Writer,Coordinator} are currently categorized under the kDefault component because strictly speaking query sampling can be used separately from the analyzeShardKey command. However, this has made debugging quite cumbersome since to see the level 1+ log messages, we need to increase the default log verbosity which includes all other components. Making the log messages go under the kSharding would allow us to see the messages by increasing just the log verbosity for the kSharding component.