Three goals:

• The output of $queryStats can also optionally be logged in mongod logs if configured. Atlas users should be able to configure this via Atlas UI. The invocations and output are not logged by default.
• Server will relax the truncation for this log line, since responses can be large
• The command returns a cursor, so we'll determine at design time how to log responses that are larger than 1 batch. (Charlie's thoughts: log each result one-by-one, each a separate log line)