Merge pull request #2100 from vladzcloudius/alert-manager-update-aler…

…ts-severities

prometheus.rules.yml: make InstanceDown alerts 'error'

prometheus/prom_rules/prometheus.rules.yml

@@ -133,23 +133,23 @@ groups:
     expr: up{job="scylla"} == 0
     for: 30s
     labels:
-      severity: "warn"
+      severity: "error"
     annotations:
       description: '{{ $labels.instance }} has been down for more than 30 seconds.'
       summary: Instance {{ $labels.instance }} down
   - alert: InstanceDown
     expr: sum(up{job="scylla"}>0)by(instance) unless sum(scylla_transport_requests_served{shard="0"}) by(instance)
     for: 1m
     labels:
-      severity: "warn"
+      severity: "error"
     annotations:
       description: '{{ $labels.instance }} instance is shutting down.'
       summary: Instance {{ $labels.instance }} down
   - alert: InstanceDown
     expr: scylla_node_operation_mode > 3
     for: 30s
     labels:
-      severity: "warn"
+      severity: "error"
     annotations:
       description: '{{ $labels.instance }} instance is shutting down.'
       summary: Instance {{ $labels.instance }} down