MDXLogs is a plugin that specialize in monitoring your server's players commands and seeing if there's any suspicious commands that's being executed, Also from my 9+ years as servers admin i could say that one of the most reason of servers downfall is griefers and moderators/admins betraying their server for any reason, But with MDXLogs you as a server owner you can prevent that from happening because you could LIVE MONITORING your players and staff and if you have a suspicion on of your staff you could monitor their commands specifically.
In addition you can monitor specific command that you wanna see.
And the best feature is "VIEW", With /mdxlogs view <player>, You can see all the commands that the specified player has written before the reset and the reset time can be configured in the config file.