Replay is true playback of any past incident. Open the page, pick the incident, watch what responders saw at every minute: the live charts, the alerts firing, the agent decisions, the operator approvals. Real-time speed by default; 2x, 4x, and step-through also supported. The training video your team never had to record.
Replay preserves three things from each incident: live SLI charts (the actual values responders saw, not reconstructed), the war-room chat thread (Slack channel or Nova Connect), and the full event timeline. All three render in sync as you scrub. Reading the incident is the same experience as living through it, minus the stress.
Real-time playback is the default; useful for new engineers learning the rhythm of an incident. 2x and 4x for experienced viewers who want to skim. Step-through advances one event at a time so an audit reviewer can dwell on each decision. The current speed is shown loudly so you do not lose track of how time is passing.
Comments responders left during the incident (Slack threads, Nova Connect notes, war-room chat) appear in replay at the moment they were written. New viewers can also leave new comments without modifying the original timeline; new comments are tagged "post-incident" so they are distinguishable.
Each team can curate a list of "canonical incidents", the 5-10 incidents new on-call engineers should replay before their first shift. The list lives next to the team's on-call rotation. Replays are the closest thing to ride-along training without the unpredictability of a live incident.
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Replay shows what actually happened. Counterfactual Replay shows what would have happened. Both useful, both different.