MaintenanceOngoingException

[rv0lt]

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1. Description / Summary

Add a filter in order to avoid logging out the Maintenace mode expcetion.

The issue is that, every time that a 500 error is generated (SERVER ERROR) it is reported as an exception in the logs in the backend (in contrast with 400 error which are not reported as such).

A maintenance mode error should be, by definition, a 503 error. Therefore, to avoid reporting it, we will filter out in the logs.

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[valyo]

Apart from the minor docstring change suggestion, I like the solution. I produces this in the container log:
| 172.18.0.6 - - [08/Nov/2024 13:55:36] "GET /api/v1/proj/list HTTP/1.1" 503 -
and in the actions.log:
{"action": {"message": "Maintenance of DDS is ongoing.", "resource": "/api/v1/user/info", "project": null, "user": "None (172.18.0.6)", "response": "503 Service Unavailable", "event": "exception.MaintenanceOngoingException", "logger": "actions", "level": "warning", "timestamp": "2024-11-08T13:55:24.950844Z"}}

[valyo]

@rv0lt just a reminder not to merger despite of my approval