Context note: flushed records replay with context.Background(). Original request context unavailable because Handle doesn't store it. This intentional for three reasons. First, flush replays old records, not current ones. When ERROR triggers, it drains last N records: INFOs and DEBUGs accumulated over time, each from different requests with different contexts. ERROR's context holds no meaningful relationship to older records. Second, storing context.Context per record would pin entire context chains in memory (parent contexts, cancellation functions, request-scoped values) until record cycles out of buffer. For 500-slot buffer with 5-minute MaxAge, that's 500 active context trees garbage collector cannot collect. Third, stale deadlines cause false failures. Record logged 30 seconds ago possessed request context whose deadline already passed. Replaying with original context would cause FlushTo.Handle to immediately fail on ctx.Err(), defeating flush purpose.
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