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* wdclient: prune filers dropped from master discovery Filer discovery only appended new addresses; it never removed ones that disappeared from the master snapshot. After a K8s filer pod rolled to a new IP the old address lingered in filerAddresses and got retried again every resetTimeout window, stalling S3 uploads on i/o timeouts. Treat the master snapshot as authoritative: keep survivors (preserving their health counters and the active round-robin index), append newcomers with fresh health, drop the rest. Empty snapshots are still ignored so a transient master outage can't wipe the list. * wdclient: skip discovery snapshots with no usable addresses Guard against the defensive case where master returns updates whose addresses are all empty; reconciling against an empty discovered set would prune every filer.