Fix syntax error in alert rules

diff --git a/cookbooks/prometheus/templates/default/alert_rules.yml.erb b/cookbooks/prometheus/templates/default/alert_rules.yml.erb
index 23bb157e475be3098725eeb230a4cde2b759d1de..61a7370b1289595afe098b8a721030e785e660e8 100644 (file)
--- a/cookbooks/prometheus/templates/default/alert_rules.yml.erb
+++ b/cookbooks/prometheus/templates/default/alert_rules.yml.erb
@@ -122,7 +122,7 @@ groups:
         annotations:
           error_rate: "{{ $value | humanizePercentage }}"
       - alert: fastly healthcheck failing
-        expr: fastly_healthcheck_status = 0
+        expr: fastly_healthcheck_status == 0
         for: 5m
         labels:
           alertgroup: fastly