mariadb has some neat user stats https://kb.askmonty.org/v/user-statistics/

however those number are meaningless if you don't guest date start of this stats (server start or last FLUSH USER_STATISTICS FLUSH CLIENT_STATISTICS). Lowly user accessng those stats can't even begin to suspect when last flush was done. So why not serve date stats where started with SHOW CLIENT_STATISTICS SHOW USER_STATISTICS ??? Should be quite trivial to implement.