Amazon CloudWatch
User Guide

Creating an Alarm from a Metric on a Graph

You can graph a metric and then create an alarm from the metric on the graph, which has the benefit of populating many of the alarm fields for you.

To create an alarm from a metric on a graph

  1. Open the CloudWatch console at https://console.aws.amazon.com/cloudwatch/.

  2. In the navigation pane, choose Metrics.

  3. Select a metric namespace (for example, EC2) and then a metric dimension (for example, Per-Instance Metrics).

  4. The All metrics tab displays all metrics for that dimension in that namespace. To graph a metric, select the check box next to the metric.

  5. To create an alarm for the metric, choose the Graphed metrics tab. For Actions, choose the alarm icon.

    
              Create an alarm from a graphed metric
  6. Under Conditions, choose Static or Anomaly detection to specify whether to use a static threshold or anomaly detection model for the alarm.

    Depending on your choice, enter the rest of the data for the alarm conditions.

  7. Choose Additional configuration. For Datapoints to alarm, specify how many evaluation periods (data points) must be in the ALARM state to trigger the alarm. If the two values here match, you create an alarm that goes to ALARM state if that many consecutive periods are breaching.

    To create an M out of N alarm, specify a lower number for the first value than you specify for the second value. For more information, see Evaluating an Alarm.

  8. For Missing data treatment, choose how to have the alarm behave when some data points are missing. For more information, see Configuring How CloudWatch Alarms Treat Missing Data.

  9. Choose Next.

  10. Under Notification, select an SNS topic to notify when the alarm is in ALARM state, OK state, or INSUFFICIENT_DATA state.

    To have the alarm send multiple notifications for the same alarm state or for different alarm states, choose Add notification.

    To have the alarm not send notifications, choose Remove.

  11. To have the alarm perform Auto Scaling or EC2 actions, choose the appropriate button and choose the alarm state and action to perform.

  12. When finished, choose Next.

  13. Enter a name and description for the alarm. The name must contain only ASCII characters. Then choose Next.

  14. Under Preview and create, confirm that the information and conditions are what you want, then choose Create alarm.