The lbaas synchronizer is an example service for the swarm synchronizer. The container of the lbaas service is implemented using haproxy service and provides load balancing function.
You can get more information of Swarm Synchronizer from the following documents
https://docs.google.com/document/d/1xaGwVbhslnGnUmniztsfC099IMxTxG-eRDeruitda3E
https://docs.google.com/document/d/1vNNO2DwwJVuvfl2Xz6SBYx_vDGdd42ZRJQmOT6MdFIE
You can get more information of LBaaS Synchronizer from the following documents
https://docs.google.com/document/d/1KwzRiidxaSJk32YEEmp0z8chcI3jJA4V0bBlAWrwE4I