RainbowBird fe59f91c84 refactor(server/flux): replace UpDownCounter with ObservableGauge for WebSocket connections ... - Updated the EngagementMetrics interface to use ObservableGauge for tracking active WebSocket connections. - Added detailed comments explaining the rationale for this change, highlighting the benefits of using a pull-based gauge over a delta-based counter. - Implemented the ObservableGauge in the createChatWsHandlers function, ensuring it accurately reflects the live count of active connections. - Removed the previous UpDownCounter logic to prevent issues with connection drift during process crashes or network interruptions.		2026-05-09 00:23:02 +08:00
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ai-context	refactor(server/flux): replace UpDownCounter with ObservableGauge for WebSocket connections	2026-05-09 00:23:02 +08:00