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PostgreSQLDown

Description {{ $labels.instance }} is rejecting query requests from the exporter, and thus probably not allowing DNS requests to work either. User services should not be effected provided at least 1 node is still alive.
Query for 1m 
>>>
	
				
					
				
			
				
					 != 1
Query Explanation

The PromQL expression pg_up != 1 checks the pg_up metric, which reports 1 when the PostgreSQL exporter can successfully reach the database. The alert fires whenever this metric is anything other than 1 (e.g., 0 or missing), meaning the exporter cannot query PostgreSQL and the instance is considered down.

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