From 36c6b03a25f95926a26b94616b64d584a1fa8fce Mon Sep 17 00:00:00 2001
From: Tom Hughes <tom@compton.nu>
Date: Thu, 23 Jul 2026 18:34:18 +0100
Subject: [PATCH] Alert if a low zoom render has been runnning for over 24
 hours

---
 cookbooks/prometheus/templates/default/alert_rules.yml.erb | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/cookbooks/prometheus/templates/default/alert_rules.yml.erb b/cookbooks/prometheus/templates/default/alert_rules.yml.erb
index dbb34ee82..ff38880a6 100644
--- a/cookbooks/prometheus/templates/default/alert_rules.yml.erb
+++ b/cookbooks/prometheus/templates/default/alert_rules.yml.erb
@@ -920,6 +920,11 @@ groups:
           alertgroup: tile
         annotations:
           render_rate: "{{ $value }} tiles/s"
+      - alert: low zoom render time
+        expr: node_systemd_unit_state{state="active",name="render-lowzoom.service"} == 1
+        for: 24h
+        labels:
+          alertgroup: tile
   - name: time
     rules:
       - alert: clock not synchronising
-- 
2.47.3