feat: send watchdaog alert to healthchecks

Author: henrywhitaker3

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

@@ -9,7 +9,7 @@ alertmanager:
         - alertname
       routes:
         - receiver: heartbeat
-          group_interval: 5m
+          group_interval: 1m
           group_wait: 0s
           matchers:
             - alertname =~ "Watchdog"
@@ -23,6 +23,8 @@ alertmanager:
     receivers:
       - name: "null"
       - name: heartbeat
+        webhook_configs:
+          url_file: /etc/alertmanager/secrets/alertmanager-secrets/heartbeat
       - name: discord_warn
         slack_configs:
           - api_url_file: /etc/alertmanager/secrets/alertmanager-secrets/slack_warn