The outage is fake. The 3 a.m. is real.

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The live incident: the clock, an errors panel over the SLO, a latency panel, the services table
the pager goes off
The log of one service, folded into runs, errors in red
the logs, live
A real shell over the incident's files
a real shell
The verdict: Fixed, the cause, the replay with every moment marked
the verdict, replayed
The live incident on a desk: errors, latency and throughput panels in a row over the SLO, every service beneath
the pager goes off
The log of one service, folded into runs, errors in red
the logs, live
A real shell over the incident's files
a real shell
The verdict docked beside the live incident: the cause, the replay with every moment marked
the verdict, beside the chart

deterministic simulation, run on your device · a real shell, mvdan/sh in WASM · graded by re-running the system, not an answer key · your runs sync to an anonymous account: a device key, nothing identifying