var cloud.google.com/go/compute/metadata.projID

2 uses

	cloud.google.com/go/compute/metadata (current package)
		metadata.go#L59: 	projID  = &cachedValue{k: "project/project-id", trim: true}
		metadata.go#L357: func (c *Client) ProjectID() (string, error) { return projID.get(c) }

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