I am assuming you are getting these logs for a dataSource which is not watched. You cannot turn off these logs unless you want to turn off logging for the entire class using logger configuration.
I think we can fix this by a code change to filter out the watched stuff in here https://github.com/apache/druid/blob/master/server/src/main/java/org/apache/druid/client/HttpServerInventoryView.java#L655.
I am not sure if we have intentionally skipped the filter, I will check and get back to you.