Hi there,

I was wondering if there is any documentation on how Prometheus Rulers 
handle the complete loss or unavailability of AlertManager nodes (basically 
when the notify function is unable to get a successful response from any AM 
node).

I see in alerting.go that there is the notion of resendDelay, my read from 
this is that the Ruler will keep notifying about an active alert 
(regardless of success) every <resendDelay> until it expires which is 4x 
<resendDelay> and then it would wait until the next evaluation period?

Thanks!
Callum

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