Reporting usage with labels

What are labels?

A label is a key-value pair that helps you organize your Google Cloud Platform resources. You can attach a label to each resource, then filter the resources based on their labels. Information about labels is forwarded to the billing system, so you can break down your billing charges by label.

Common uses of labels

Here are some common use cases for labels:

  • Team or cost center labels: Add labels based on team or cost center to distinguish resources owned by different teams (for example, team:research and team:analytics). You can use this type of label for cost accounting or budgeting.

  • Component labels: For example, component:redis, component:frontend, component:ingest, and component:dashboard.

  • Environment or stage labels: For example, environment:production and environment:test.

  • Owner or contact labels: Add labels based on the owner or a primary contact for resources.

  • State labels: For example, state:active, state:readytodelete, and state:archive.

Requirements for labels

The labels applied to a resource must meet the following requirements:

  • Each resource can have multiple labels, up to a maximum of 64.
  • Each label must be a key-value pair.
  • Keys have a minimum length of 1 character and a maximum length of 63 characters, and cannot be empty. Values can be empty, and have a maximum length of 63 characters.
  • Keys and values can contain only lowercase letters, numeric characters, underscores, and dashes. All characters must use UTF-8 encoding, and international characters are allowed.
  • The key portion of a label must be unique. However, you can use the same key with multiple resources.
  • Keys must start with a lowercase letter or international character.

Managing labels in Cloud Pub/Sub

In Cloud Pub/Sub, labels are often used to organize fees for a given billing account. Fees are associated with the billing account of the project that contains the requested resource, but you might want to establish additional associations. For example, a subscription that belongs to one project might be created for a topic that belongs to a different project. You can use labels to associate that topic and subscription with a common cost center.

Cloud Pub/Sub resources do not inherit labels from each other. In the example above, you would set the same label on both the topic and the subscription in order to associate those charges.

You can use the following features to apply labels to Cloud Pub/Sub resources:

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