alert_rules.yml

ALERT containerAlert
    IF absent(((time() - container_last_seen{name="mongodb"}) < 5)) FOR 5s
    LABELS { severity="page" }
    ANNOTATIONS {
    	SUMMARY = "Instance {{$labels.instance}} down",
    	DESCRIPTION = "Instance= {{$labels.instance}}, Service/Job ={{$labels.job}} is down for more than 2 sec."
    }
    
ALERT DiskWillFillIn4Hours
   IF predict_linear(node_filesystem_free{job='node'}[1h], 4*3600) < 0 FOR 5m
    LABELS { severity="page" }