add OnionskinsDropped alert rule

use 'for: 15m' consistently also for the TorHighDnsTimeoutRate rule

defaults/main.yml

@@ -151,21 +151,23 @@ tor_prometheus_alert_rules:
       description: '{% raw %}{{ $labels.id }} key certificate will expire and auto-shutdown in {{ $value }} hours.{% endraw %}'
   - alert: TorHighDnsTimeoutRate
     expr: '(sum by (instance)(rate(tor_relay_exit_dns_error_total{reason="tor_timeout"}[15m])))/(sum by (instance)(rate(tor_relay_exit_dns_query_total[15m])))*100 > 1.5'
-    for: 10m
+    for: 15m
     labels:
       severity: warning
     annotations:
       summary: 'DNS timeout rate is above 1.5% for over 10 minutes'
       description: '{% raw %}{{ printf "%.3f" $value }}% of tor DNS queries on {{ $labels.instance }} result in a timeout.{% endraw %}'
-#  - alert: TorOnionskinsDropped
-#    expr: 'rate(tor_relay_load_onionskins_total{action="dropped"}[15m]) > 0'
-#    for: 15m
-#    labels:
-#      severity: warning
+  - alert: TorOnionskinsDropped
+    expr: 'rate(tor_relay_load_onionskins_total{action="dropped"}[15m]) > 0'
+    for: 15m
+    labels:
+      severity: warning
+    annotations:
+      description: '{% raw %}Relay {{ $labels.id }} is dropping onionskins for over 15 minutes.{% endraw %}'
 #  - alert: TorFlagExitChanged
 #    expr: 'changes(tor_relay_flag{type="Exit"}[15m]) > 0'
 #    labels:
-#      severity: warning
+#      severity: informational
 #    annotations:
 #      description: "{% raw %}The exit flag changed on relay {{ $labels.id }}. Was that intended?{% endraw %}"
 #  - alert: TorFlagChanged