Two confident fixes missed this production bug

A series of production incidents showed how captured request replay can reveal failures that alerts, code review, staging, and conventional tests missed. In one case, a returning user was assigned to a deprovisioned tenant because an email-domain mapping persisted in the database after infrastructure deletion; initial fixes targeted the wrong layer or incomplete data state, while replaying the real signup request against production-like local data exposed both the drift and an ORM soft-delete join issue. In another case, a nightly gateway panic occurred when storage returned no error but also no object for a deleted snapshot, a behavior hidden by test doubles that always supplied valid files. Replaying the captured crashing request reproduced the panic locally and enabled a regression test and clearer not-found handling. The account argues that production traffic captured through eBPF and replayed locally provides a deterministic validation loop for reproducing incidents, testing fixes against realistic dependency responses and data states, and avoiding deployment-based debugging; it presents Proxymock as a tool for recording and replaying this traffic.

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