ExternalIP returns the instance's primary external (public) IP address.

Get returns a value from the metadata service.

Hostname returns the instance's hostname.

InstanceAttributes returns the list of user-defined attributes, assigned when initially creating a GCE VM instance.

InstanceAttributeValue returns the value of the provided VM instance attribute.

InstanceID returns the current VM's numeric instance ID.

InstanceName returns the current VM's instance ID string.

InstanceTags returns the list of user-defined instance tags, assigned when initially creating a GCE instance.

InternalIP returns the instance's primary internal IP address.

NumericProjectID returns the current instance's numeric project ID.

OnGCE reports whether this process is running on Google Compute Engine.

ProjectAttributes returns the list of user-defined attributes applying to the project as a whole, not just this VM.

ProjectAttributeValue returns the value of the provided project attribute.

ProjectID returns the current instance's project ID string.

Scopes returns the service account scopes for the given account.

Subscribe subscribes to a value from the metadata service.

Zone returns the current VM's zone, such as "us-central1-b".

NotDefinedError is returned when requested metadata is not defined.