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Traefik high HTTP 5xx error rate backend
critical

Description Traefik backend 5xx error rate is above 5%
Query for 1m 
>>>
	
				
					
					
						sum
					
				
			
				
					(
				
			
				
					
					
						rate
					
				
			
				
					(
				
			
				
					
				
			
				
					{code=~"5.*"}[3m])) by (backend) / 
				
			
				
					
					
						sum
					
				
			
				
					(
				
			
				
					
					
						rate
					
				
			
				
					(
				
			
				
					
				
			
				
					[3m])) by (backend) * 100 > 5
Query Explanation

The query sums the per‑backend rate of 5xx responses over the last 3 minutes, divides it by the total request rate for each backend, multiplies by 100, and checks if the result exceeds 5 %. The alert fires when any backend’s 5xx error percentage is greater than 5 % during that interval.

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