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1. In Alerting > Notification channels, click Add channel.
2. Enter a Name. The Type is webhook, Enter the unique OnCall URL.
3. Select Send reminders and set a 5m (minute) interval.
4. In a dashboard, create a panel that will generate heartbeat alerts.
5. In the Metrics tab, enter 0 in the query field.
6. In the Alerting tab, enter an alert name, and conditions that allow the alert to always be enabled. Set the alert interval.
7. In Notifications, select the name of your heartbeat channel.
8. Click Save.