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Thanos Rule Sender Is Failing Alerts
critical

Description Thanos Rule {{$labels.instance}} is failing to send alerts to alertmanager.
Query for 5m 
>>>
	
				
					sum by (job, instance) (
				
			
				
					
					
						rate
					
				
			
				
					(
				
			
				
					
				
			
				
					{job=~".*thanos-rule.*"}[5m])) > 0
Query Explanation

The query computes the per‑instance rate of thanos_alert_sender_alerts_dropped_total (alerts dropped by a Thanos rule) over the past 5 minutes, sums it by job and instance, and triggers the alert whenever the resulting rate is greater than 0 for any instance – meaning that the Thanos rule is currently failing to deliver alerts to Alertmanager.

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