FiberTelemetryModule

A fiber observer that records fiber defects on the Axial activity source: every fiber that settles with a defect produces an axial.flow.fiber.defect error span, and every defect the runtime proves unobservable (a discarded fork handle, or a race/timeout loser) produces an axial.flow.fiber.unobserved_defect error span.

Installs the telemetry fiber observer on a flow, typically once at the application edge.

A fiber observer that gives every forked fiber a real axial.flow.fiber span: opened at the fork site (so the parent is the workflow span that forked it), closed when the fiber settles, and stamped with the fiber's status and any defect. Unobservable defects still produce a linked axial.flow.fiber.unobserved_defect span.

Installs the span-per-fiber telemetry observer on a flow: every forked fiber becomes an axial.flow.fiber span covering fork to settle. See observerWithSpans.