hosts/monitoring-3: Alert on fem.social unavailable

hosts/monitoring-3/rules.yml

@@ -89,7 +89,7 @@ groups:
       description: "GPG with fingerprint {{ $labels.fingerprint }} is expiring in less then six weeks"
   - alert: NadjaTopIPv4ProxyBroken
     expr: probe_success{job="blackbox_local_http6", target="blog.nadja.top"} != on (target) probe_success{job="blackbox_local_http4", target="blog.nadja.top"}
-    for: 5m
+    for: 15m
     labels:
       severity: critical
     annotations:
@@ -102,3 +102,11 @@ groups:
     annotations:
       summary: "Too many notification requests failed"
       description: "Too many notification requests to Alertmanager integration {{ $labels.integration }} failed"
+  - alert: FemSocialDown
+    expr: min(probe_success{target="fem.social", job=~"blackbox_local_http.*"}) == 0
+    for: 5m
+    labels:
+      severity: critical
+    annotations:
+      summary: "fem.social unavailable via HTTP"
+      description: "fem.social is not fully reachable via HTTP"