Event streaming, telemetry lineage and app log context - v4.12.0 milestone - #90
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…stone The wrapper half of the progressive-rendering program: the multi-shot reply contract and envelope-mode SSE dialect (producer EventStreamWriter + streaming /api/event host + PostOffice.stream/streamTo consumer), the engines' reply_to mechanism on the primitive bus, business correlation-id continuity, full span lineage with the engines' distributed-trace dataset on stdout logs, and the app-log-context feature with the packaged default template. Version aligned with the engine lock-step line at 4.12.0 (npm lineage jumps the legacy 4.3.x). Co-Authored-By: Claude Code <noreply@anthropic.com>
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What
The Node.js language pack's half of the progressive-rendering program,
released as v4.12.0 - the version aligns with the Mercury Composable engine
lock-step line, and the npm lineage jumps from the legacy pre-composable 4.3.x
directly to 4.12.0.
with
EventStreamWriter, the streaming/api/eventhost speaking thehybrid envelope-mode SSE dialect with the pinned 406/503/408 degradations,
PostOffice.stream()(async iterator with conformance guards) andstreamTo()(the relay composition), on the primitive bus's new reply_tomechanism.
span as parent; outbound stamps, RPC-tag suppression, segment spans and
sender attribution per the engines' rules; the engines' distributed-trace
dataset emitted on the
distributed.tracingstdout stream.my_cidtag outbound, themy_correlation_idview injected at delivery,runWithTrace()(nowexported) carrying it for edge callers.
default-log-context.yaml,resources/app-log-context.yamloverride,app.log.contextflag, and theupdateContext()developer API - structured log lines join the trace onspanId.echoes.
Why
Same milestone as the Python twin: progressive rendering with the complete
observability story, live-verified against both engines and the Python pack
in the interop report - the foundation for AI SDLC adapters in this runtime.
Verification
tsc clean, node --test 76/76, mkdocs strict clean; live cross-runtime drives
recorded in
docs/test-reports/progressive-rendering-interop.md.🤖 Generated with Claude Code
Co-Authored-By: Claude Code noreply@anthropic.com