Oleks
cb369d3be3
Adds a postPatch step that applies metamcp-observability.patch to
the upstream metatool-ai/metamcp v2.4.22 source before pnpm build.
The patch:
* Drops in apps/backend/src/lib/observability/{trace,metrics}.ts:
AsyncLocalStorage trace context + parser/synthesizer per the W3C
contract (Specs/mcp-request-id), plus a hand-rolled
Counter/Histogram so we don't have to touch pnpm-lock.yaml /
pnpmDeps hash (no new npm dependency).
* Wires a top-level express middleware in apps/backend/src/index.ts
that binds trace context, observes mcp_hop_duration_seconds on
response close, and counts mcp_cancellation_total when the
downstream client hangs up mid-response.
* Adds /metrics to the Express app and last-resort process traps
(unhandledRejection / uncaughtException) feeding
mcp_uncaught_throw_total — the smoking-gun signal from
cluster#44.
* Patches process-managed-transport.send() to inject
params._meta.traceparent on every outbound JSON-RPC bound for a
stdio child (MCP _meta convention, Specs/mcp-request-id).
Retire when this lands upstream.