diff --git a/configs/monitoring/pull.nix b/configs/monitoring/pull.nix
index 6654f24..1642037 100644
--- a/configs/monitoring/pull.nix
+++ b/configs/monitoring/pull.nix
@@ -60,6 +60,11 @@ in
           for = "1h";
           annotations.summary = "{{$labels.job}}: Using lots of RAM.";
         }
+        {
+          alert = "UptimeMonster";
+          expr = "time() - node_boot_time_seconds > 2592000";
+          annotations.summary = "{{$labels.job}}: up for more than 30 days.";
+        }
         {
           alert = "HostDown";
           expr = ''up == 0'';