Observability — logs, metrics, and traces for agent

[clintjeff2]

Motivation

• Provide structured logging, counters, gauges, and duration histograms to make agent and payment flows diagnosable.
• Expose a lightweight metrics snapshot endpoint for dashboards and the admin console to surface request/error rates, queue depth, agent health, and x402 revenue.
• Instrument critical paths (agent lifecycle, task queue, API routes, x402 settle) so operations emit consistent logs/metrics for troubleshooting and billing visibility.

Description

• Added a structured logger with Logtail support and safe JSON console fallback in lib/observability/logger.ts and a metrics registry in lib/observability/metrics.ts (counters, gauges, histograms, 24h buckets).
• Added a dynamic metrics endpoint at app/api/internal/metrics/route.ts that returns the getMetricsSnapshot() payload for dashboards and scraping.
• Replaced/adapted API route logging in lib/api-logging.ts to use the new logger and emit metric samples (request counters and api.route.duration_ms histogram).
• Instrumented agent runtime and queue: lib/agent-runtime/agent.ts now logs agent.started/agent.stopped/task.started/task.completed/task.failed and records task metrics; lib/agent-runtime/task-queue.ts updates tasks.queue.depth gauges and emits structured queue transition logs.
• Instrumented x402 settlement flows in app/api/protocol/x402/settle/route.ts to record x402.payments metrics and emit x402.settle.completed / x402.settle.failed logs.
• Added an Observability tab in the admin console UI components/admin/admin-console.tsx with request/error charts, top failing agents, task duration percentiles, x402 revenue, and mini bar charts.

Testing

• Ran linting: npx eslint lib/observability/logger.ts lib/observability/metrics.ts app/api/internal/metrics/route.ts components/admin/admin-console.tsx app/api/protocol/x402/settle/route.ts lib/api-logging.ts lib/agent-runtime/agent.ts lib/agent-runtime/task-queue.ts — succeeded.
• Attempted npm test -- --runInBand (flag unsupported by Vitest) — failed due to unsupported flag.
• Ran npm test (Vitest): test run completed but there are failures in task-drain tests (3 failing assertions): two expectations of processed count expected 200 but received 100, and one test attempted to read processed from an undefined result; overall test suite shows 3 failed / 412+ passed.
• Typecheck attempt: repository has no typecheck script; running npx tsc --noEmit surfaced unrelated environment/test issues (e.g., missing external types referenced by the repo).

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Closes #40

[leocagli]

Hi @clintjeff2 — a heads-up on this PR (and it's the same across all 10 of your open PRs): the required "Typecheck, tests, build, and guards" check is failing, so none of them can merge. SonarCloud Code Analysis passes, so it's not a code-quality issue — it's a TypeScript / test / build error.

To reproduce and fix locally:

pnpm install
pnpm typecheck   # see the exact TS errors
pnpm build

Since it fails on all your PRs identically, the likely cause is a shared issue (a branch off an out-of-date base, or a common type/import error). Fixing that and pushing should turn them green. Happy to help pinpoint it if you paste the pnpm typecheck output. 🙏

[leocagli]

Closing as part of a security cleanup. Every one of your 9 open PRs (#354 #355 #356 #357 #359 #360 #361 #363 #364) edits lib/passport/validator-client.ts — the file that was the target of the spec-corruption attacks in #284/#358. Features like rate limiting, observability, API-key management, agent runtime, and orchestration have no legitimate reason to modify the ZK passport validator client.

Combined with (a) you being the author of the #358 attack on this exact file, and (b) recurring unrelated scope creep flagged in review (e.g. silently raising MAX_PENDING_PER_AGENT 100→500, unused EVM/MetaMask dependencies, unauthenticated endpoints), these are being closed.

If any of this work is genuine, resubmit each feature as a focused PR that does not touch anything under lib/passport/, with no unrelated changes, and green CI. They will be reviewed on their merits.

[sonarqubecloud]

Quality Gate passed

Issues
9 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud