feat: add HandoffMetrics for measuring agent handoff timing#5442
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feat: add HandoffMetrics for measuring agent handoff timing#5442
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Add HandoffMetrics to measure the cost of agent handoffs, including: - drain_duration: time to drain the old activity (on_exit + pending speech) - new_activity_duration: time to start/resume the new activity - on_enter_duration: time for the new agent's on_enter callback - stt_reused / realtime_session_reused: whether resources were reused
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Summary
HandoffMetricsto measure agent handoff cost, emitted viametrics_collectedand attached toAgentHandoff.metricsdrain_duration,new_activity_duration,on_enter_duration, and totaldurationstt_reused,realtime_session_reused)Limitation
HandoffMetricsdoes not include the WebSocket connection time for new realtime sessions or STT streams. When resources are not reused, the connection is established asynchronously in a background task. This connection time is already reported separately viaRealtimeModelMetrics.acquire_timeandSTTMetrics.acquire_timethrough the existingmetrics_collectedpipeline.