Add PostHog error tracking, richer telemetry, docs analytics, and release annotations

[leoisadev1]

Builds on #80 (stacked PR — merging this lands the changes into the #80 branch; merge #80 afterward to ship everything to main).

What's new

1. Error tracking (feat(telemetry))

• captureException() in the telemetry module sends PostHog $exception events through the same zero-dependency transport.
• Privacy-first sanitization: stack-frame paths reduced to package-relative names or bare basenames (never home dirs/project layouts); messages scrubbed of emails, URLs, quoted text, long tokens, and home directories; cause chains capped at 3; frames capped at 20.
• Per-process guard rails: dedupe by error object and error class, max 5 reports per process.
• Stable issue grouping via $exception_fingerprint = ErrorName:error_code for EmailSdkErrors.
• Captured at: failed send() calls (handled; usage errors like validation/unknown-adapter excluded) and unexpected CLI crashes (unhandled).
• New analytics context: source (sdk|cli) on all events, email batch sent summary event, ci_vendor detection (GitHub Actions, GitLab, CircleCI, Jenkins, Travis, Buildkite, Vercel, generic).
• README/notice disclosures updated; changeset included. All existing opt-outs unchanged.

2. Docs site analytics (feat(docs))

• posthog-js on email-sdk.dev: SPA pageviews (history-change), exception autocapture, web vitals. Vercel Analytics stays. Session replay is off by default (one-line flip in apps/fumadocs/src/lib/posthog.ts).
• CSP in vercel.json allows https://*.posthog.com (script-src + connect-src).
• Privacy policy discloses PostHog and links the package telemetry docs.

3. Release annotations (ci(release))

• After a successful changesets publish, posts a "vX.Y.Z released" annotation to PostHog so release markers appear on every dashboard chart. Requires a POSTHOG_PERSONAL_API_KEY repo secret (scope: annotation:write, project 468042); skips gracefully without it.

PostHog workspace (already live, built via MCP)

• New Reliability & Errors dashboard (failure rates, error codes, exceptions by type/source/version, latency p95, batch health) + 7 new usage insights (version adoption, platform split, adapter market share, dry-run vs real, CI vs local, activation funnel, SDK vs CLI) + 3 docs insights (adapter-page views for sponsor value, getting-started, blog).
• Alerts: send-failure rate >20%/day and exceptions >25/day → email.
• Action "Adapter docs viewed"; dashboard headers updated; starter dashboard unpinned.

Verification

• bun run release:ci passes (types, 117 package tests + workspace tests, registry checks, full build, pack dry-runs).
• Live smoke test from the built CLI: all 6 events ingested (client created, failed email sent, $exception, 3× cli command run), and Error Tracking created the issue EmailProviderError — "Resend failed with 401: API key is invalid" with fully resolved, sanitized frames (cli.js, core.js, resend.js — no user paths).

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Created with PostHog Code

[vercel]

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Project	Deployment	Actions	Updated (UTC)
email-sdk-fumadocs	Ready	Preview, Comment	Jun 13, 2026 2:59am

[greptile-apps]

Greptile Summary

This PR adds PostHog error tracking, enriched telemetry (source tagging, CI detection, batch summaries), browser analytics for the docs site, and a release annotation step to the publish workflow. The core new surface is captureException() in the SDK telemetry module, which manually constructs Sentry-style $exception payloads through the existing zero-dependency HTTP transport, with a thorough privacy-first sanitization pipeline.

• SDK/CLI error tracking: captureException() redacts messages (emails, URLs, tokens, home directories), reduces stack frames to package-relative basenames, deduplicates by object identity and error class, and caps reports at 5 per process; captured for provider failures in core.ts and unhandled CLI crashes.
• Telemetry enrichment: telemetrySource ("sdk"|"cli"), ci_vendor detection for 6 CI systems, and a new email batch sent summary event on sendBatch.
• Docs site analytics: posthog-js initialized in a useEffect on the root TanStack Router route with session replay disabled; CSP updated to specific PostHog hosts rather than a wildcard.
• Release annotations: Post-publish step calls the PostHog annotations API; skips gracefully when the secret is absent.

Confidence Score: 5/5

Safe to merge — all new telemetry paths are fire-and-forget with comprehensive try/catch guards, existing opt-outs are unchanged, and the privacy sanitization is well-tested.

The error tracking implementation is thorough: hostile error shapes (throwing getters, non-Error throws, circular cause chains) are all handled, deduplication prevents spamming PostHog, and every redaction rule has explicit test coverage. The core send/sendBatch paths are unchanged in behavior — telemetry is always void-and-ignored. The only new observable side-effects are the PostHog HTTP calls, bounded by the 3s timeout and a 5-report-per-process cap.

No files require special attention for merge safety. The minor observations in core.ts (empty-batch event), telemetry.ts (dedup classKey design), and the workflow step (version guard) are all non-blocking.

Important Files Changed

Filename	Overview
packages/email-sdk/src/telemetry.ts	Major addition: captureException() with privacy-first sanitization, buildExceptionList, parseStackFrames, redactErrorMessage, detectCiVendor, isReportableSendError. Well-tested and guarded; minor dedup/ordering design trade-offs noted.
packages/email-sdk/src/core.ts	Adds telemetrySource tagging, captureException on reportable send failures, and a sendBatch summary event. Correct logic; empty-batch event fires unconditionally (P2).
packages/email-sdk/src/telemetry.test.ts	Thorough test coverage for exception capture: sanitization, deduplication, cause chains, hostile stacks, CI detection, and disabled state — all new paths well-covered.
packages/email-sdk/src/core.test.ts	New createEmailClient telemetry suite tests source tagging, exception reporting, usage-error exclusion, batch summary, mixed-adapter, and fallback adapter resolution — comprehensive.
apps/fumadocs/src/lib/posthog.ts	New PostHog browser init for docs site with defaults: '2026-01-30' and capture_exceptions: true; no explicit capture_console_errors: false and no reverse proxy — both noted in prior review comments.
.github/workflows/release.yml	Adds graceful PostHog release annotation step; bun -e failure could silently produce a vundefined annotation or fail the step with no guard (P2).
vercel.json	CSP updated with specific PostHog hosts (us-assets.i.posthog.com for script-src, us.i.posthog.com + us-assets.i.posthog.com for connect-src) — tighter than a wildcard.
packages/email-sdk/src/cli.ts	Adds telemetrySource: 'cli', source: 'cli' on run events, and unhandled-crash exception reporting before the CLI run summary; dedup correctly excludes already-reported SDK errors.

Sequence Diagram

sequenceDiagram
    participant CLI as cli.ts
    participant Core as core.ts (send/sendBatch)
    participant Tel as telemetry.ts
    participant PH as PostHog API

    CLI->>Core: "createEmailClient({telemetrySource:"cli"})"
    Core->>Tel: "capture("client created", {source:"cli"})"
    Tel-->>PH: POST /capture/ (queued)

    CLI->>Core: client.send(message)
    Core->>Core: sendWithAdapters()
    alt success
        Core->>Tel: "capture("email sent", {success:true, source})"
    else provider failure (isReportableSendError)
        Core->>Tel: "capture("email sent", {success:false})"
        Core->>Tel: "captureException(error, {handled:true})"
        Tel->>Tel: buildExceptionList() → redactErrorMessage() + parseStackFrames()
        Tel->>Tel: dedup check (seenObjects, seenClasses, budget)
        Tel-->>PH: POST /capture/ ($exception event)
    end

    CLI->>Tel: "capture("cli command run", {source:"cli"})"
    Note over CLI,Tel: captureCliRun() → flush()
    Tel->>Tel: flush() — await all pending

    alt unhandled crash (not CliFailure/EmailSdkError)
        CLI->>Tel: "captureException(error, {handled:false})"
        Tel-->>PH: POST /capture/ ($exception)
    end

    Note over PH: Release workflow
    CLI->>PH: POST /api/projects/468042/annotations/ (vX.Y.Z released)

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_{Reviews (7): Last reviewed commit: "fix(telemetry): stop tagging Vercel prod..." | Re-trigger Greptile}