In some times you want to receive notifications from grafana only in working hours. You may configure quiet hours, but in this case grafana show status as unhealthy, just not notifying you.
It’s possible to set hours, when alerts actually present and should be sent.
Just add new prometheus condition with code (time in UTC):
((hour() >= 9) * (hour() <= 18)) OR on() vector(0)
This expression returns 81 at 9:00-9:59, 100 at 10:00-10:59 etc between 9:00 and 18:00 (6 p.m.).
And add condition for this expression >0
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