Azure Alerts Management Service provides a single pane of glass of alerts across Azure Monitor.
curl \ -H "Authorization: Bearer $ACCESS_TOKEN" \ /providers/Microsoft.AlertsManagement/operations
curl \ -H "Authorization: Bearer $ACCESS_TOKEN" \ /providers/Microsoft.AlertsManagement/alertsMetaData
curl \
-H "Authorization: Bearer $ACCESS_TOKEN" \
/subscriptions/{subscriptionId}/providers/Microsoft.AlertsManagement/alerts