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

flake.lock

@@ -646,11 +646,11 @@
     },
     "nixpkgs_5": {
       "locked": {
-        "lastModified": 1755186698,
-        "narHash": "sha256-wNO3+Ks2jZJ4nTHMuks+cxAiVBGNuEBXsT29Bz6HASo=",
+        "lastModified": 1753549186,
+        "narHash": "sha256-Znl7rzuxKg/Mdm6AhimcKynM7V3YeNDIcLjBuoBcmNs=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "fbcf476f790d8a217c3eab4e12033dc4a0f6d23c",
+        "rev": "17f6bd177404d6d43017595c5264756764444ab8",
         "type": "github"
       },
       "original": {

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"