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Crystal Jin 00fb3329dc Add idle recovery debug telemetry
Summary: Add debug-gated QUIC lifecycle snapshots to distinguish stale-connection recovery from general request slowness. Requests now record connection age, last RX/TX age, signed idle-deadline distance, and timer counts at request start and completion. mvfst reports separate idle and keepalive callbacks plus overdue-deadline observations; ngtcp2 reports its unified transport timer. Recreated requests preserve the prior connection UUID so the request can be joined to the close reason and replacement connection.

Reviewed By: jbeshay

Differential Revision: D125287129

fbshipit-source-id: 921046a7ed2a6273fde59be0125dcbd8904ccaf4
2026-10-21 10:03:13 -07:00
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2026-09-25 14:26:14 -07:00