How do I ensure in do not disturb mode the clock alarm will be heard?

1. You will need to set priority interruptions, this can be done through settings menu. Select sound and select do not disturb
2. In here you have Priority only allows, if you select events and reminders you will receive your alarm at the time set
3. In addition, you can receive designated calls or messages by activating then going to “Calls/message from” and managing your contacts list