Order shutdown

[fox983]

Hello,
I'd like to set an order of shutdown services because of ntopng generate an alert of anomalous termination.
I think it's related to a key in redis (see here https://github.com/ntop/ntopng/issues/1896).
If I manually stop ntopng service from dashboard and reboot OPNsense, I didn't have any error.
If I reboot normally, notpng generates an error: ...[Error][Process] Started after anomalous termination (bug report) ntopng v.3.8.190910...

Thank you