code: func (sdk *FabricSDK) Close() {
  	logger.Debug("SDK closing")
  	if pvdr, ok := sdk.provider.LocalDiscoveryProvider().(closeable); ok {
  		pvdr.Close()
  	}
  	if pvdr, ok := sdk.provider.ChannelProvider().(closeable); ok {
  		pvdr.Close()
  	}
  	sdk.provider.InfraProvider().Close()
  }
docs: // Close frees up caches and connections being maintained by the SDK