FiberRegistry

A FiberRegistry (core Axial, no telemetry dependency) tracks every live fiber below one edge install and answers "what is my runtime doing right now?" Install it with Flow.withFiberRegistry; registry.DumpAt(clock) renders the tree and registry.Snapshot() returns structured FiberDump values.

Method inventory

• registry.Settled() returns the most recently settled fibers, oldest first. Each carries its final metadata (status, start and settle times, Duration) and, for a failed fiber, its cause rendered as text, for typed errors as well as defects.
• registry.Stats() returns totals per fiber name since the registry was installed: how many ran, failed, and were interrupted, with total and longest duration. Unnamed fibers are counted under (unnamed).
• registry.UnobservedDefects() returns defects that nobody joined or awaited.
• registry.StartedCount counts every fiber started.
• registry.Interrupt id signals one live fiber to stop, and registry.InterruptByName "name" signals every live fiber with that name and returns how many it signalled. Neither waits; whoever joins or awaits the fiber sees Cause.Interrupt.

History is bounded: FiberRegistry() keeps the last 200 settled fibers and unobserved defects, and FiberRegistry(capacity) sets another bound. Totals are kept for every name. Install the registry with Flow.withFiberRegistry to get typed failure text; an observer composed by hand sees defects only.

Read the observability guide for the operational interpretation and Supervision and fiber observability for unobserved-defect semantics.