code: func (g *Cloud) ListBetaSecurityPolicy() ([]*computebeta.SecurityPolicy, error) {
  	ctx, cancel := cloud.ContextWithCallTimeout()
  	defer cancel()
  
  	mc := newSecurityPolicyMetricContextWithVersion("list", computeBetaVersion)
  	v, err := g.c.BetaSecurityPolicies().List(ctx, filter.None)
  	return v, mc.Observe(err)
  }
docs: // ListBetaSecurityPolicy lists all security policies in the project.