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HAProxy backend connection errors
critical

Description Too many connection errors to {{ $labels.fqdn }}/{{ $labels.backend }} backend (> 100 req/s). Request throughput may be too high.
Query for 1m 
>>>
	
				
					(sum by (proxy) (
				
			
				
					
					
						rate
					
				
			
				
					(
				
			
				
					
				
			
				
					[1m]))) > 100
Query Explanation

The rule computes the per‑proxy rate of haproxy_backend_connection_errors_total over the last minute, sums these rates, and fires when the total exceeds 100 errors per second, meaning the {{ $labels.fqdn }}/{{ $labels.backend }} backend is experiencing more than 100 connection errors each second.

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