[Feature] Only notify once on failing scheduled tests

[erdmenchen]

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Notifications

Description

Currently there is only an option to get notified on every test and an option to get notified on failing tests.

However if I have a service degragation and the speed test fails for a longer period of time, I get flooded with failing test notifications.

Say I have a scheduled speed test set up, that runs a test every 5min and I experience a significant service degragation for a longer period of time (e.g. hours or even days).
Then I get a failing threshold breach notification email on every test every 5min.

I would expect it to only send me one notification for the first failure and then only send me another notification if it recovers and a test succeeds. Or at least start skipping more and more notifications the longer the test keep failing.

This way I am not spammed with notification emails for consecutive failed tests.

If there already is a setting to configure this behavior, please let me know ;-)