Insufficient logging with querying Kafka cluster load with "allow_capacity_estimation" parameter set

[Lincong]

Users can query Kafka cluster load with the allow_capacity_estimation parameter. For example:

GET http://<Cruise Control host>:<port>/kafkacruisecontrol/load?allow_capacity_estimation=true

However, looking at the Cruise Control log file, we cannot tell whether allow_capacity_estimation took effect or not. The log trace needs to be enriched so that users can get more insights regarding the processing of the request with this parameter.