About Cluster of microservices，How to deploys multiple instances to one worker?
@fans can you please elaborate on your question? If you mean how to have multiple replicas of one specific type of worker, you can use a container orchestrator for that, it doesn’t relate to Zeebe at all.
Hi, I deployed two instance for a microservice application,the zeebe client was embed in every instance to be a worker, that is the two worker have the same jobType.And the zeebe how to use gRPC communicate with them, and how to achieve load balancing.Zeebe’s doc just introduct zeebe communicate with a sinle zeebe client. 
[Zeebe | Camunda Cloud Docs]
Those two workers poll for work from the broker.