http://docs.mongodb.org/manual/

Command medianKey is deprecated but still in 2.4 docs

Command netstat is not an internal command, it is however only available on mongos.

Some internal commands have no '_' prefix in the http://docs.mongodb.org/manual/reference/command/ list even though they do have it when looking at the specific command. This applies to for instance the recvChunk* commands.

None of the following commands: diagLogging, netstat, closeAllDatabases, connPoolSync are internal. They belong to the clusterAdmin role.