Don't ntfy for logrotate failures and add container names to ntfy alerts

common/ntfy/default.nix

@@ -26,6 +26,12 @@
       default = [ ];
       description = "Unit names to skip failure notifications for.";
     };
+
+    hostLabel = lib.mkOption {
+      type = lib.types.str;
+      default = config.networking.hostName;
+      description = "Label used in ntfy alert titles to identify this host/container.";
+    };
   };
 
   config = lib.mkIf config.thisMachine.hasRole."ntfy" {

common/ntfy/service-failure.nix

@@ -32,7 +32,7 @@ in
             --max-time 30 --retry 3 \
             ${cfg.curlExtraArgs} \
             -H "Authorization: Bearer $NTFY_TOKEN" \
-            -H "Title: Service failure on ${config.networking.hostName}" \
+            -H "Title: Service failure on ${cfg.hostLabel}" \
             -H "Priority: high" \
             -H "Tags: rotating_light" \
             -H "Message: Unit $unit failed at $(date +%c)" \