package obs-eio

Changes

Unreleased

• API change: Obs_trace.t is now a private record, so callers can inspect parsed/generated contexts but cannot construct W3C-invalid ones directly.
• Obs_trace.of_traceparent now rejects all-zero trace IDs and span IDs, as required by the W3C trace context spec.
• Obs_trace.generate and Obs_trace.child_span now avoid the same reserved all-zero trace ID and span ID values.
• Obs_eio.create now accepts ?on_backend_error, a per-handle callback for synchronous backend failures. The callback receives a typed backend operation and is itself protected; cancellation still propagates.
• Metric registration now rejects conflicting declarations for the same metric name (kind, label names, or help text) before calling the backend.

0.1.0

• Initial standalone OPAM package: core observability handle, traceparent helpers, structured span logs, and metric declaration/emission.