title: NodeJS gRPC client is getting UNAVAILABLE without retrying
body: <p>I have NodeJs generated client, which is connecting over AWS Load Balancer to GRPC backend. The client is created as singleton. The problem is that after some period of time, it connection gets UNAVAILABLE and next GRPC call fails with TCP Socket write error.</p>
  
  <p>Does NodeJS client support GRPC retry policy ? How can I enable it ?</p>
  
  <p>We were thinking about creating own retry logic, but at first we want to ensure it is not implemented in gRPC client already.
  Thanks all !</p>