Could a system fail before writing the event?¶

Yes. An action can begin, or partly take effect, before the application reaches the stage that writes its expected record. Missing completion evidence does not necessarily mean there was no attempt or partial outcome.

Logging position in the process matters¶

Some systems log requests immediately and results later; others write only after completion. A crash, power loss, storage fault or service stop can interrupt that sequence. Memory-buffered events can vanish on sudden shutdown, while network failure can prevent a client record reaching a server.

The expected event must therefore be tied to a request, start, commit, completion or reporting stage.

Look for failure and partial-state evidence¶

Preserve crash and restart logs, service errors, storage warnings and incomplete transactions. Client, network, database or downstream records may show earlier or later stages even when the normal application entry is absent.

A fault should not be assumed merely because it is possible. Establish that one occurred at the relevant time and could interrupt that specific logging path, then describe the extent of activity the surviving records support.