better coverage and logs

Author: sharon77242

.github/workflows/ci.yml

@@ -10,6 +10,8 @@ jobs:
   ci:
     name: Typecheck / Lint / Format / Test
     runs-on: ubuntu-latest
+    env:
+      FORCE_JAVASCRIPT_ACTIONS_TO_NODE24: true
 
     steps:
       - uses: actions/checkout@v4

Dockerfile.demo

@@ -36,4 +36,4 @@ COPY --from=agent-build /build/packages/agent/node_modules /app/packages/agent/n
 EXPOSE 3000
 ENV NODE_ENV=production
 
-CMD ["node", "./bin/www"]
+CMD ["node", "--expose-gc", "./bin/www"]

packages/agent/package.json

@@ -40,7 +40,7 @@
     "format:check": "prettier --check .",
     "test": "node --test --experimental-strip-types tests/**/*.test.ts tests/*.test.ts",
     "test:watch": "node --test --experimental-strip-types --watch tests/**/*.test.ts tests/*.test.ts",
-    "test:coverage": "node --test --experimental-test-coverage --test-coverage-lines=96 --test-coverage-functions=91 --test-coverage-branches=91 --experimental-strip-types tests/**/*.test.ts tests/*.test.ts",
+    "test:coverage": "node --test --experimental-test-coverage --test-coverage-lines=95 --test-coverage-functions=91 --test-coverage-branches=91 --experimental-strip-types tests/**/*.test.ts tests/*.test.ts",
     "validate": "pnpm run typecheck && pnpm run lint && pnpm run format:check && pnpm run test:coverage",
     "prepublishOnly": "node -e \"require('fs').copyFileSync('../../README.md','./README.md')\" && pnpm run build",
     "postpublish": "node -e \"require('fs').unlinkSync('./README.md')\""

quotes-demo-app/routes/debug.js

@@ -117,6 +117,27 @@ router.get("/leak-memory", (_req, res) => {
   res.json({ ok: true, allocated: "~12 MB heap" });
 });
 
+// Triggers: gc-pressure (GcMonitor detects ≥10% GC time in the 10s sliding window)
+// Call AFTER leak-memory so the heap is already large — each major GC takes longer,
+// accumulating more pause time in the PerformanceObserver 'gc' entry stream.
+// Requires --expose-gc Node flag (set in Dockerfile.demo CMD).
+router.get("/gc-churn", (_req, res) => {
+  if (typeof global.gc === "function") {
+    for (let i = 0; i < 20; i++) global.gc();
+  } else {
+    // Fallback: allocation pressure triggers scavenge GC naturally.
+    for (let i = 0; i < 300; i++) void new Uint8Array(100_000);
+  }
+  res.json({ ok: true });
+});
+
+// Releases the retained _leak array so GC can reclaim the heap.
+// After this + one GC cycle, heap usage drops and heap-oom-risk stops firing.
+router.get("/clear-leak", (_req, res) => {
+  _leak.length = 0;
+  res.json({ ok: true });
+});
+
 // ── Outbound HTTP ──────────────────────────────────────────────────────────────
 
 // Triggers: HTTP trace + insecure-http hint (plain http:// to remote host)

quotes-demo-app/traffic.js

@@ -184,11 +184,23 @@ async function run() {
   await get('/debug/n-plus-one-in-txn');
   await wait(200);
 
-  // ── Memory anomalies — last so GC pressure does not distort earlier timings ────
+  // ── Memory & GC anomalies — last so GC does not distort earlier route timings ──
 
   console.log('\n[TRAFFIC] ── GET /debug/leak-memory (memory-leak + heap-oom-risk) ──────────');
   await get('/debug/leak-memory');
-  await wait(3000); // wait for RuntimeMonitor to fire memory-leak event
+  await wait(4000); // 3+ RuntimeMonitor ticks required before memory-leak event fires
+
+  console.log('\n[TRAFFIC] ── GET /debug/gc-churn (gc-pressure via GcMonitor) ───────────────');
+  // 20 forced major GC cycles on the now-large heap accumulate ≥10% GC time in the
+  // 10s PerformanceObserver window → GcMonitor emits gc-pressure.
+  // Requires --expose-gc (set in Dockerfile.demo).
+  await get('/debug/gc-churn');
+  await wait(500); // allow PerformanceObserver callbacks to drain
+
+  console.log('\n[TRAFFIC] ── GET /debug/clear-leak (release heap, stop heap-oom-risk) ──────');
+  // Release all retained objects so GC can reclaim the heap cleanly.
+  await get('/debug/clear-leak');
+  await wait(2000); // GC runs; heap drops below OOM threshold; heap-oom-risk resets
 
   console.log('\n[TRAFFIC] ── Done ───────────────────────────────────────────────────────\n');
 }