[8.x] Dispatch events when maintenance mode is enabled and disabled #38826
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This feature makes it easy to trigger actions when the application is put into, or taken out of, maintenance mode.
I found myself wanting this today when setting up monitoring with OhDear.
They have endpoints for
/start-maintenance
and/end-maintenance
and will not send notifications about the site being down during this period.If this PR is merged, I could listen for the events in my application and automatically ping my monitoring service when going in or out of maintenance mode. Or log it, or any action that users see fit.
I tried to follow conventions, but if anything is in the wrong place, or should have better names; just comment and I'll fix it, or feel free to refactor and push changes.
Thanks!