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* fix/frontend-node-state: Refactor NodeInfoKey and Context Handling in Meta Server • Removed unused cluster_id from NodeInfoKey struct. • Updated HeartbeatHandlerGroup to return Context alongside HeartbeatResponse. • Added current_node_info to Context for tracking node information. • Implemented on_node_disconnect in Context to handle node disconnection events, specifically for Frontend roles. • Adjusted register_pusher function to return PusherId directly. • Updated tests to accommodate changes in Context structure. * fix/frontend-node-state: Refactor Heartbeat Handler Context Management Refactored the HeartbeatHandlerGroup::handle method to use a mutable reference for Context instead of passing it by value. This change simplifies the context management by eliminating the need to return the context with the response. Updated the Metasrv implementation to align with this new context handling approach, improving code clarity and reducing unnecessary context cloning. * revert: clean cluster info on disconnect * fix/frontend-node-state: Add Frontend Expiry Listener and Update NodeInfoKey Conversion • Introduced FrontendExpiryListener to manage the expiration of frontend nodes, including its integration with leadership change notifications. • Modified NodeInfoKey conversion to use references, enhancing efficiency and consistency across the codebase. • Updated collect_cluster_info_handler and metasrv to incorporate the new listener and conversion changes. • Added frontend_expiry module to the project structure for better organization and maintainability. * chore: add config for node expiry * add some doc * fix: clippy * fix/frontend-node-state: ### Refactor Node Expiry Handling - **Configuration Update**: Removed `node_expiry_tick` from `metasrv.example.toml` and `MetasrvOptions` in `metasrv.rs`. - **Module Renaming**: Renamed `frontend_expiry.rs` to `node_expiry_listener.rs` and updated references in `lib.rs`. - **Code Refactoring**: Replaced `FrontendExpiryListener` with `NodeExpiryListener` in `node_expiry_listener.rs` and `metasrv.rs`, removing the tick interval and adjusting logic to use a fixed 60-second interval for node expiry checks. * fix/frontend-node-state: Improve logging in `node_expiry_listener.rs` - Enhanced warning message to include peer information when an unrecognized node info key is encountered in `node_expiry_listener.rs`. * docs: update config docs * fix/frontend-node-state: **Refactor Context Handling in Heartbeat Services** - Updated `HeartbeatHandlerGroup` in `handler.rs` to pass `Context` by value instead of by mutable reference, allowing for more flexible context management. - Modified `Metasrv` implementation in `heartbeat.rs` to clone `Context` when passing to `handle` method, ensuring thread safety and consistency in asynchronous operations.