[Query] Retry behaviour of the client

[vipinvkmenon]

I have a query regarding the client in terms of how events are handled in failures:
If the downstream is unavailable or due to back pressure.
How does the client retry the events? Is there a fixed number of times for retry?
How does the client work with backpressure? When are the events dropped (in the synchronous case)
How many events will be in the queue?

Thanks for your help