code: func (agent *Agent) initialize(ctx context.Context) (context.Context, error) {
  	ctx, err := agent.configureLogging(ctx)
  	if err != nil {
  		return ctx, err
  	}
  	if err = agent.configureMonitoring(ctx); err != nil {
  		return ctx, err
  	}
  
  	// TODO(smut): Remove fallback on metadata server.
  	if agent.server == "" {
  		agent.server, err = metadata.Get("instance/attributes/machine_provider_server")
  		if err != nil {
  			return ctx, err
  		}
  	}
  	if agent.serviceAccount == "" {
  		agent.serviceAccount, err = metadata.Get("instance/attributes/machine_service_account")
  		if err != nil {
  			return ctx, err
  		}
  	}
  
  	options := auth.Options{
  		GCEAccountName:         agent.serviceAccount,
  		ServiceAccountJSONPath: auth.GCEServiceAccount,
  	}
  	agent.client, err = auth.NewAuthenticator(ctx, auth.SilentLogin, options).Client()
  	if err != nil {
  		return ctx, err
  	}
  	metadataClient := metadata.NewClient(agent.client)
  	agent.hostname, err = metadataClient.InstanceName()
  	if err != nil {
  		return ctx, err
  	}
  	agent.mp, err = getClient(ctx, agent.client, agent.server)
  	if err != nil {
  		return ctx, err
  	}
  	return ctx, nil
  }
docs: // initialize initializes the agent.