DO-1: add an integration test (test/mock/tool-timing-server.test.mjs) that
constructs a real createDocmostMcpServer with a spy onMetric, links a Client
over InMemoryTransport, invokes get_workspace (no input schema, so the wrapped
handler always runs) and asserts onMetric fired with
("mcp_tool_duration_seconds", <number>, { tool: "get_workspace" }). This locks
that the monkeypatch wraps every tool AND labels with the registration name —
which the isolated timeToolHandler unit test does not. Mutation-verified
(mislabel -> test fails). The tool's expected backend failure (ECONNREFUSED)
is tolerated: the wrapper times in a finally on throw too, so the metric fires.
DO-2: reword the mcp.service.ts "zero overhead when disabled" comment to
"negligible overhead" — the registerTool wrapper still runs performance.now()
+ an async try/finally per tool call when onMetric is undefined (the
`onMetric?.()` short-circuits the label build; cost is immaterial at
tool-call rate), so "zero" was literally inaccurate.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
packages/mcp stays free of prom-client/server: it only calls an optional
DocmostMcpConfig.onMetric(name, value, labels?) sink the host provides.
- client.ts: onMetric on the config; fires collab_connect_timeouts_total
once, only inside the 25s connect-timeout callback (the connect-vs-unload
signal). cleanup() clears the timer on every other finish path, so no
double-count.
- index.ts: createDocmostMcpServer monkeypatches server.registerTool (before
registerShared + inline tools are registered) to wrap every handler with
timeToolHandler — times in a finally on success AND throw, re-throws
unchanged, emits mcp_tool_duration_seconds{tool=<registered name>} (bounded
cardinality). Single choke point catches all tools.
- mcp.service.ts: the per-request config resolver injects onMetric ONLY when
isMetricsEnabled(), routing mcp_tool_duration_seconds -> observeMcpTool and
collab_connect_timeouts_total -> incConnectTimeout. Disabled / standalone
(stdio, no onMetric) -> undefined -> zero-overhead no-op.
New node:test unit (tool-timing.test.mjs) covers the wrapper's value/throw
preservation and the standalone no-op. packages/mcp/build/ is gitignored,
not committed (CI rebuilds it).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Extends the #355 perf-metrics registry (all behind the METRICS_PORT hard
gate — nullable instruments, no-op helpers when unset). New families:
- collab_doc_load_duration_seconds{size_bucket} — onLoadDocument timed on
the real DB-load paths only (the already-loaded early-return is skipped).
- size_bucket added to collab_store_duration_seconds; storeDocument returns
the ydoc byte length (reusing its single Y.encodeStateAsUpdate, no second
encode) so onStoreDocument observes size without extra cost.
- collab_docs_open (gauge, read-on-scrape via collect() from
hocuspocus.getDocumentsCount() — never inc/dec'd, so it can't drift) +
collab_doc_loads_total / collab_doc_unloads_total (afterLoad/afterUnload).
- collab_connect_duration_seconds — onConnect->connected, correlated by a
WeakMap keyed on the shared request (leak-free; the current client uses
one socket per document).
- collab_auth_duration_seconds — wraps onAuthenticate (success and failure).
- sizeBucket() shared helper (lt64k|lt256k|lt1m|ge1m, 4 bounded values).
The mcp_tool_duration_seconds histogram + collab_connect_timeouts_total
counter helpers are registered here but wired in pass 2 (MCP callback).
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
agent_coder