You’ll find these pages under the Alerts & Schedules section of Looker’s Admin menu. Non-admins with the create_alerts permission will not be able to view these pages. Choose one for more information:

• Manage Alerts
  View, filter by, edit, and delete dashboard tile alerts. Navigate to the dashboard containing the tile with the alert.
• Alert History
  View running, complete, and failed alerts.
• Schedules
  View, reassign, and delete data delivery schedules.
• Schedule History
  View history of and troubleshoot scheduled data deliveries.
• External Emails
  Monitor data being sent from Looker to external email addresses.