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Nats server down
critical

Description NATS server has been down for more than 5 minutes
Query for 5m 
>>>
	
				
					
					
						absent
					
				
			
				
					(
				
			
				
					
				
			
				
					{job="nats"})
Query Explanation

The query absent(up{job="nats"}) evaluates to true when Prometheus sees no up metric with job="nats", meaning no NATS instance is reporting as alive; after this condition persists for 5 minutes the alert fires, indicating the NATS server is down.

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