Using Cloud Monitoring with Cloud KMS

Cloud Monitoring can be used to monitor operations performed on resources in Cloud Key Management Service.

This topic provides:

  • an example for monitoring when a key version is scheduled for destruction
  • information about monitoring other Cloud KMS resources and operations

Before you begin

If you haven't already done so, set up a Google Cloud project that has the Cloud Key Management Service API enabled. These steps are documented in the Cloud KMS Quickstart.

Create a counter metric

Use the gcloud logging metrics create command to create a counter metric that will monitor any occurrence of the scheduled destruction of a key version.

gcloud logging metrics create key_version_destruction \
  --description "Key version scheduled for destruction" \
  --log-filter "resource.type=cloudkms_cryptokeyversion \
  AND protoPayload.methodName=DestroyCryptoKeyVersion"

You can list your counter metrics using the gcloud logging metrics list command:

gcloud logging metrics list

For more information about creating a counter metric, including via the Google Cloud Console and the Monitoring API, see Creating a counter metric.

Create an alerting policy

You can create alerting policies to monitor the values of metrics and to notify you when those metrics violate a condition.

To create an alerting policy that monitors one or more resources, follow these steps:

  1. In the Google Cloud Console, go to the Monitoring page.

    Go to Monitoring

  2. In the Monitoring navigation pane, select Alerting, and then select Create policy.
  3. If the button Return to Legacy UI is displayed and if you want to follow these instructions, then click it. You can create an alerting policy by using the Preview interface; however, these instructions are for the Legacy UI.
  4. Click Add condition:
    1. The settings in the Target pane specify the resource and metric to be monitored. In the Find resource type and metric field, select logging/user/key_version_destruction. Leave the resource name empty.
    2. The settings in the Configuration pane of the alerting policy determine when the alert is triggered. Complete this pane with the settings in the following table.
      Conditions pane

      Condition triggers if Any time series violates
      Condition is above
      Threshold 0
      For most recent value
    3. Click Add.
  5. To advance to the notifications section, click Next.
  6. Optional: To add notifications to your alerting policy, click Notification channels. In the dialog, select one or more notification channels from the menu, and then click OK.

    If a notification channel that you want to add isn't listed, then click Manage notification channels. You are taken to the Notification channels page in a new browser tab. From this page, you can update the configured notification channels. After you have completed your updates, return to the original tab, click Refresh, and then select the notification channels to add to the alerting policy.

  7. To advance to the documentation section, click Next.
  8. Click Name and enter a name for the alerting policy.
  9. Optional: Click Documentation, and then add any information that you want included in a notification message.
  10. Click Save.
For more information, see Alerting policies.

To test your new notification, schedule a key version for destruction and then check your email to see if the notification was sent.

This alert will be triggered each time a key version has been scheduled for destruction. Note that the alert will get automatically resolved (even though the key version remains scheduled for destruction), so there will be two email notifications, one for the scheduled destruction, and one for the alert being resolved.

For more information about alert policies, see Introduction to alerting. To learn how to turn on, turn off, edit, copy, or delete an alert policy, see Managing policies.

For information about different types of notifications, see Notification options.

Monitoring administrative activities vs. data access

The scheduled destruction of a key version is an administrator activity. Administrator activities are logged automatically. If you want to create an alert for data access of a Cloud KMS resource, e.g. monitoring when a key is used for encryption, you need to enable Data Access logs and then create an alert policy as described in this topic.

For more information about logging of Cloud KMS administrative activities and data access, see Using Cloud Audit Logs with Cloud KMS.

Rate quota metrics

Cloud KMS supports the following rate quota metrics:


For information about monitoring these quotas using Cloud Monitoring, see Monitoring quota metrics.