fix: added watchdog kuma checkin

Author: henrywhitaker3

argo/cluster/monitoring/kube-prometheus-stack/chart/values.yaml

@@ -8,11 +8,20 @@ alertmanager:
       group_by:
         - alertname
       routes:
+        - receiver: heartbeat
+          group_interval: 5m
+          group_wait: 0s
+          matchers:
+            - alertname =~ "Watchdog"
+          repeat_interval: 5m
         - receiver: discord
           match:
             severity: critical
     receivers:
       - name: "null"
+      - name: heartbeat
+        webhook_configs:
+          - url_file: /etc/alertmanager/secrets/alertmanager-secrets/kuma
       - name: discord
         slack_configs:
           - api_url_file: /etc/alertmanager/secrets/alertmanager-secrets/slack