HAProxy backend max active session > 80% warning
Session limit from backend {{ $labels.proxy }} reached 80% of limit - {{ $value | printf "%.2f"}}%
>>>
((
>0) * 100) / (
> 0) > 80
The rule computes the percentage of active sessions for each HAProxy backend by dividing haproxy_backend_current_sessions by haproxy_backend_limit_sessions (only when both are > 0) and multiplying by 100; it fires when this percentage exceeds 80 %. In other words, any backend whose active sessions are more than 80 % of its configured session limit will trigger the alert.
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