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Istio high 4xx error rate
warning

Description High percentage of HTTP 4xx responses in Istio (> 5%).
Query for 1m 
>>>
	
				
					
					
						sum
					
				
			
				
					(
				
			
				
					
					
						rate
					
				
			
				
					(
				
			
				
					
				
			
				
					{reporter="destination", response_code=~"4.*"}[5m])) / 
				
			
				
					
					
						sum
					
				
			
				
					(
				
			
				
					
					
						rate
					
				
			
				
					(
				
			
				
					
				
			
				
					{reporter="destination"}[5m])) * 100 > 5
Query Explanation

The query computes the 5‑minute rate of all Istio‑reported requests and the rate of those with a 4xx response code, divides the latter by the former, multiplies by 100, and fires the alert when this percentage exceeds 5 %. Thus, if more than five percent of destination‑side requests return client errors over the past five minutes, the alert triggers.

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