Stratumsphere allows notifications over three mediums:
SMS
Email
Slack

Notifications are generated per HASH Scheduler. The two kinds of notifications are:

Monitor Triggered
This notification triggers whenever the percentage of unhealthy workers on a scheduler exceeds the Alarm Threshold set on a scheduler.

Monitor Resolved
This notification triggers whenever the percentage of unhealthy workers goes lower than the Alarm Threshold set on a scheduler.

See this article to read more about Alarm Threshold.
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