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HAProxy high HTTP 5xx error rate server
critical

Description Too many HTTP requests with status 5xx (> 5%) on server {{ $labels.server }}
Query for 1m 
>>>
	
				
					((sum by (server) (
				
			
				
					
					
						rate
					
				
			
				
					(
				
			
				
					
				
			
				
					{code="5xx"}[1m])) / sum by (server) (
				
			
				
					
					
						rate
					
				
			
				
					(
				
			
				
					
				
			
				
					[1m]))) * 100) > 5
Query Explanation

The rule computes, for each server, the percentage of HTTP responses that are 5xx over the last minute by dividing the per‑second rate of haproxy_server_http_responses_total{code="5xx"} by the total response rate and multiplying by 100; the alert fires when this error‑rate exceeds 5 % for a given server.

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