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How to update an anomaly detection monitor to account for local time zone?

  1. You need the following information to make the update request through the monitor API:
    • Your Datadog API key and APP key for authentication
    • The monitor ID and query from your anomaly detection monitor:
      Monitor ID and Query
    • The TZ identification string for the time zone related to your metric, for example America/New_York or Europe/Paris. Locate your preferred time zone in the TZ column on the List of tz database time zones (canonical format recommended).

  2. Create an updated version of the monitor query by adding a timezone argument to the anomalies() function call.

    • For example, if you wanted to change the query shown above to use New York’s local time, the query would be updated to:
    avg(last_4h):anomalies(avg:system.cpu.user{role:trace-cassandra} by {host}, 'basic', 2, direction='both', alert_window='last_15m', interval=60, count_default_zero='true', timezone='America/New_York') >= 1
    
  3. Use the Edit a Monitor API to update the monitor’s definition.

    • Examples are available in Python, Ruby, and cURL.
    • Only include the ID and query in the request to avoid overriding existing settings. The name, message, options, and tags are not required.

Note: A monitor with the time zone parameter evaluates using the specified time zone. The graphs shown on the monitor status page and in snapshots will correctly show the bounds used for those evaluations. However, the evaluation graph on the edit page does not respect the time zone. Saving the monitor using the UI removes the time zone from the monitor definition.

Further Reading