grpc-js: Propagate connectivity error information to request errors #2598
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Specifically, propagate error information from transport code to subchannel connectivity state updates, and from there to pickers returned by pick_first and round_robin. This will help debug connectivity errors, particularly in cases when the request errors do not occur close to the connection attempts in the logs.
The change to the
UnavailablePicker
constructor to accept partial status objects is copied from master.This change does not cover xDS code.