The folder in https://github.com/opnsense/core/tree/25.7.2/src/opnsense/scripts OPNsense has been deleted from the directory https://github.com/opnsense/core/tree/25.7.3/src/opnsense/scripts, The breaks Monit monitoring for carp and gateway. It is absent in version 25.7.3 in github. Why? This broke my install upon updating.
It seems it was moved and the GUI did not automatically update the path.
Monit needs to change the file urls in the GUI to
/usr/local/opnsense/scripts/monit/carp_status.php
and
/usr/local/opnsense/scripts/monit/gateway_alert.php
In the Monit settings I think is the fix.