Module observe 

What a run reports about itself: as it goes, to an Observer, and once it ends, on its Run, with its Trace when one was asked for.

Structs

Interest

What an Observer asks for: a set of flags. | and |= unite two sets, union does in a const, and contains tests one.

Replay

A trace replayed on demand, with one working context.

Trace

A run’s trace: initial, then each step’s changes.

TraceOptions

What a run’s trace records. A run is traced when RunOptions::trace is given these.

TraceStep

One step of a Trace.

Enums

Event

One event of a run, borrowed for the call to Observer::on: an observer copies out what it keeps.

StepResult

What a step was. Serialized, and read, as its lowercase name.

Traits

Observer

What a host is told about a run as it goes: counters, histograms and spans, kept by the host.