Module observability 

Modules

audit

harn-obs-audit conformance gate.

otel

request_id

Ambient request_id scope threaded into .harn callees by hosts that mint a request id at ingress (today: harn-serve’s HTTP/ACP/MCP/A2A adapters via http_codec::fresh_request_id; future: in-process callers that already track one).

vocabulary

Standardized attribute vocabulary for the harn.* observability schema.