From: Tom Hughes <tom@compton.nu>
Date: Tue, 26 Jan 2021 22:25:24 +0000 (+0000)
Subject: Improve alert readability
X-Git-Url: https://git.openstreetmap.org./chef.git/commitdiff_plain/2c385f3d70fb6867de8c6f0d846eba62fba1aeb0?ds=sidebyside

Improve alert readability
---

diff --git a/cookbooks/prometheus/templates/default/alert_rules.yml.erb b/cookbooks/prometheus/templates/default/alert_rules.yml.erb
index d2e076281..d870444ca 100644
--- a/cookbooks/prometheus/templates/default/alert_rules.yml.erb
+++ b/cookbooks/prometheus/templates/default/alert_rules.yml.erb
@@ -84,12 +84,12 @@ groups:
   - name: memory
     rules:
       - alert: low memory
-        expr: node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes * 100 < 10
+        expr: node_memory_MemAvailable_bytes / node_memory_MemTotal_bytes < 0.1
         for: 5m
         labels:
           alertgroup: "{{ $labels.instance }}"
         annotations:
-          memory_free: "{{ $value }}%"
+          memory_free: "{{ $value | humanizePercentage }}"
       - alert: memory pressure
         expr: rate(node_vmstat_pgmajfault[1m]) > 1000
         for: 5m