TODO - solidify this.

TODO: investigate grpc heartbeat - don't limit to grpc implemention Message is empty by design - Will add more fields in future if needed.

Warning before killing the process after grace_period Worker self terminates ..no response on this.

https://msdn.microsoft.com/en-us/library/t6xf43e0(v=vs.110).aspx.

Matching ILogger semantics https://github.com/aspnet/Logging/blob/9506ccc3f3491488fe88010ef8b9eb64594abf95/src/Microsoft.Extensions.Logging/Logger.cs.