What is time-travel debugging?

What this post added

This post explains the concept of time-travel debugging, its history, and implementation techniques (record & replay, snapshotting, instrumentation). It then details how time-travel debugging can be applied to production environments, particularly in conjunction with durable execution. The post highlights that durable execution's record-and-replay mechanism, which records external inputs and replays code deterministically, enables time-travel debugging in production by allowing execution history to be captured and analyzed offline. It contrasts this with traditional debugging methods and discusses scenarios where temporary recording in production is feasible. The post also elaborates on the mechanics of durable execution, emphasizing its deterministic nature and how it handles external interactions (volatile functions) and state persistence.