func ValidateConfigMapUpdate(newCfg, oldCfg *core.ConfigMap) field.ErrorList {
	allErrs := field.ErrorList{}
	allErrs = append(allErrs, ValidateObjectMetaUpdate(&newCfg.ObjectMeta, &oldCfg.ObjectMeta, field.NewPath("metadata"))...)

	if oldCfg.Immutable != nil && *oldCfg.Immutable {
		if newCfg.Immutable == nil || !*newCfg.Immutable {

		serveG:                      http2newGoroutineLock(),
		pushEnabled:                 true,
		sawClientPreface:            opts.SawClientPreface,
	}
	if newf != nil {
		newf(sc)
	}

	s.state.registerConn(sc)
	defer s.state.unregisterConn(sc)

	// The net/http package sets the write deadline from the
	// http.Server.WriteTimeout during the TLS handshake, but then