diff --git a/demo/karma.yaml b/demo/karma.yaml
index c9ba109c4..8517784c3 100644
--- a/demo/karma.yaml
+++ b/demo/karma.yaml
@@ -24,6 +24,12 @@ alertmanager:
       proxy: true
       cors:
         credentials: same-origin
+      healthcheck:
+        filters:
+          DeadMansSwitch:
+            - alertname=Random Instances
+            - instance=server15
+
 alertAcknowledgement:
   enabled: true
   duration: 15m0s