A notification is sent sometime between 15 to 30 minutes. A second notification is sent sometime between 31 to 45 minutes. Note: Azure Monitor alerts Stateless alerts Stateless alerts fire each time the condition is met. The alert condition for all stateless alerts is always fired. * All activity log alerts are stateless. * The frequency of notifications for stateless metric alerts differs based on the alert rule's configured frequency: -Alert frequency of less than 5 minutes: While the condition continues to be met, a notification is sent sometime between one and six minutes. -> Alert frequency of equal to or more than 5 minutes: While the condition continues to be met, a notification is sent between the configured frequency and double the frequency. For example, for an alert rule with a frequency of 15 minutes, a notification is sent sometime between 15 to 30 minutes. Reference: https://learn.microsoft.com/en-us/azure/azure-monitor/alerts/alerts-overview