warning = fmt.Errorf("workload selector specified without labels") // nolint: stylecheck
		}
	}

	return warning, errs
}

// ValidateSidecar checks sidecar config supplied by user
var ValidateSidecar = RegisterValidateFunc("ValidateSidecar",
	func(cfg config.Config) (Warning, error) {
		errs := Validation{}
		rule, ok := cfg.Spec.(*networking.Sidecar)
		if !ok {