How to Tag Users in Slack Notifications

Was digging deeper with our slack understanding person and figured out why the slack notifications don’t work, it currently says please take a look @username, when it needs to be "please take a look <@username> , could someone point me at where these modules are on the monitoring server and i could try change that small part for me

(also username needs to be your slack id, not name, planning to create notification users specifically for these)