v3.139.1

• Added support for session and node shutdown hints on the session attach stream. When a node shutdown hint was received, the balancer pessimized (banned) the connection to that YDB node, so subsequent gRPC calls were routed to other nodes.
• Deprecated config.WithDisableOptimisticUnban() option and config.Config.DisableOptimisticUnban() method. Optimistic unban (where a successful gRPC call would immediately unban a banned connection) was disabled for all connections; nodes are now unbanned only after the next background discovery refresh if the node is still present in the discovery response.

Full Changelog: v3.139.0...v3.139.1