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MongoDB replication lag
critical

Description Mongodb replication lag is more than 10s
Query 
>>>
	
				
					(
				
			
				
					
				
			
				
					{member_state="PRIMARY"} - on (set) group_right 
				
			
				
					
				
			
				
					{member_state="SECONDARY"}) / 1000 > 10
Query Explanation

The rule computes the time difference (in seconds) between the optimeDate of the PRIMARY member and each SECONDARY member of a MongoDB replica set—using the subtraction, on (set) group_right join, and division by 1000—and triggers the alert when any secondary’s lag exceeds 10 seconds.

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