The configuration files are stored in GitLab at the location: https://git.geant.net/gitlab/puppet-apps/dashboard/tree/test. You may have to ask DevOps to grant you access to the dashboard project
Navigate to the https://git.geant.net/gitlab/puppet-apps/dashboard/blob/test/files/etc/dashboard/core/routers_community.conf file and remove the router name, SNMP Community String and IP Address from the file:
Commit the change to the GITLab repository and raise a support ticket for the DevOps team to push the change to Test, UAT and Production instances of the current Dashboard.
The physical file on the server is: /usr/lib64/nagios/plugins/dbupdates/conf/routers_community.conf (Should you wish to be naughty and update the file directly on the server!!!)
*** Because the router is been shut down, it will no longer send SNMP Traps and as such, there is no need to run the PHP scripts referenced in the CRON jobs.