In the config file, go to the section called alerts-module and change the section that looks like this where it says true to false. I think this should fix it.
# Notifies staff when a player mines blocks listed in “blocks”. xray-alerts:
Unfortunately, there is nothing like a /history command for servers that you’ve been to. You’re able to /find players to find what server they’re on, if you know anyone currently on the server, but that’s about it.