yorkie

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**Description**: Introduce stateful session affinity in yorkie cluster to resolve [Split-Brain of WatchDocument](https://github.com/yorkie-team/yorkie/blob/main/design/sharded-cluster-mode.md#risks-and-mitigation). In other words, implementing session affinity to enable session routing with strong affinity over current ring hash...

krapie

Add test for reattach document after deactivated

1

**What this PR does / why we need it**: Add test for reattach document after deactivated **Which issue(s) this PR fixes**: Fixes # **Special notes for your reviewer**: **Does this...

hackerwins

Clean up presence after client deactivation

1

**What this PR does / why we need it**: Clean up presence after client deactivation **Which issue(s) this PR fixes**: Fixes # **Special notes for your reviewer**: **Does this PR...

hackerwins

**What would you like to be added**: It seems necessary to collect metrics for MongoDB sharded clusters. Currently, the existing monitoring system focuses on Yorkie metrics and go process metrics,...

sejongk