Zookeeper missing leader
critical

Description Zookeeper cluster has no node marked as leader
Query
>>>
	
				
					
					
						sum
					
				
			
				
					(
				
			
				
					
				
			
				
					) == 0
				
			
    
Query Explanation

The query sum(zk_server_leader) == 0 adds up the zk_server_leader metric across all Zookeeper instances; if the total is zero, it means no instance reports itself as the leader. The alert fires when this condition holds, indicating the cluster currently has no elected leader.

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