code: func generateToken(c context.Context) (string, error) {
  	logging.Warningf(c, "%q is generating pprof token", auth.CurrentIdentity(c))
  	return pprofToken.Generate(c, nil, nil, 0)
  }
docs: // generateToken generates new pprof token.
  //
  // The token is URL safe base64 encoded string. Possession of such token allows
  // to call pprof endpoints.
  //
  // The token expires after 12 hours.