| name | observability-and-growth |
| description | Full instrumentation from day one. PostHog consolidates product analytics + feature flags + error tracking (one platform, one bill). GA4 via GTM (14-step automation, custom dimensions over events, server-side tagging). Sentry (deep error tracking + performance). Stripe (webhook-first with idempotent processing). Listmonk on Coolify (newsletters via Amazon SES SMTP relay). PLG 7-layer framework. Programmatic SEO (5 page types). Incident auto-remediation via Sentry→Inngest pipeline. AI search (GEO) awareness. Local business conversions (phone_click, direction_click, form_submit, booking_click) with CRO patterns for both SaaS and local. |
| metadata | {"version":"2.1.0","updated":"2026-05-03","effort":"high","model":"sonnet"} |
| license | Rutgers |
| compatibility | {"claude-code":">=2.0.0","agentskills":">=1.0.0"} |
| submodules | ["analytics-configuration.md","conversion-optimization.md","email-marketing-and-listmonk.md","feature-flags-and-experiments.md","sentry-alert-rules.md","square-payments.md","stripe-billing.md","user-feedback-collection.md","workers-tracing-otlp.md"] |
| priority | 2 |
| pack | backend |
| stage | stable |
| triggers | ["posthog","sentry","analytics","stripe","growth"] |
| paths | ["concern:observability"] |
13 — Observability and Growth
Tiered PostHog+Sentry+GA4 stacks wired from day one; feature flags, PLG patterns, incident auto-remediation.
Instrumentation tiers
Per _kernel/standards.md#integrations:
- Tier 1 (solo) — PostHog + Workers Tracing OTLP (2 vendors max, cookie-free, free tier covers <10k MAU)
- Tier 2 (enterprise) — + Sentry @sentry/cloudflare v9 + GA4/GTM + Axiom
- Tier 3 (LLM-heavy >10k calls/mo) — + AI Gateway
PostHog (Tier 1 cornerstone)
- Snippet on every HTML page w/
persistence:'memory' (cookie-free); capture_pageview + capture_pageleave + autocapture:true
- Unified platform: product analytics + feature flags + session replay + error tracking
- CSP:
script-src + connect-src for posthog domain
- Per-feature event naming:
<feature>:<action> (signup:complete, editor:save, share:copy)
Sentry (Tier 2)
@sentry/cloudflare v9 + withSentry wrapper; project via mcp__sentry__create_project (org:megabyte-labs)SENTRY_DSN via wrangler secret put- Pattern:
withSentry(env => ({ dsn, tracesSampleRate: 1.0, sendDefaultPii: false }), worker)
- Breadcrumbs before risky ops; capture exception w/ context tags (
worker | route | userId)
- Release tracking via
SENTRY_RELEASE env; Workers Tracing handles I/O spans
Workers Tracing (Tier 1 + 2) / GA4 + GTM (Tier 2) / AI Gateway (Tier 3)
- Workers Tracing:
[observability] enabled = true in wrangler.jsonc — zero-config OTel I/O tracing; export to Axiom, Honeycomb, Grafana, Datadog via @opentelemetry/exporter-trace-otlp-http
- GA4 + GTM: container snippet (head script + noscript iframe); CSP:
googletagmanager.com + google-analytics.com + analytics.google.com + region1.google-analytics.com; server-side tagging for EU; custom dimensions over custom events
- AI Gateway:
env.AI.run() auto-routes; direct Anthropic: https://gateway.ai.cloudflare.com/v1/{account}/{gateway}/anthropic/v1/messages; caching + rate-limit + fallback + per-call logging
Stripe (SaaS billing only — per rules/payments-routing.md)
- Webhook-first w/ idempotent processing (D1 dedupe table
payment_events(event_id, source, processed_at) UNIQUE)
Stripe-Signature HMAC + 5-min replay window- Mint products + prices via MCP (idempotent via
lookup_key); subscription state machine in D1
STRIPE_WEBHOOK_SECRET via POST /v1/webhook_endpoints
Square (accept-money default — per rules/payments-routing.md)
- Square Web Payments SDK card form + Apple Pay + Google Pay + Cash App Pay
Square-Signature HMAC-SHA256 w/ 6-hr replay window; idempotency_key UUID per request (24-hr dedupe)- Nonprofit verified-501c3 discount (2.6%+10¢ vs 3.5%+15¢)
Listmonk (newsletter — self-hosted on Coolify)
- Amazon SES SMTP relay (
LISTMONK_FROM_EMAIL); listmonkSendTx(env, { templateAlias, ... }) via KV-cached alias→id map
- Templates in
emails/*.html synced via scripts/listmonk-sync.mjs
- Auth:
Authorization: token <user>:<key> (Listmonk 3.x API-user pattern)
PLG 7-Layer Framework
- Discovery — SEO + AI search + word-of-mouth + paid
- Sign-up — passwordless preferred (Clerk M2M JWT)
- Activation — first-value-in-X-min metric (aha moment per
rules/feature-flags.md instrumentation)
- Engagement — DAU/MAU ratio, session depth
- Retention — D1/D7/D30 cohort
- Revenue — upgrade trigger, expansion
- Referral — viral coefficient, two-sided rewards
Programmatic SEO (5 page types)
/integrations/{tool} · /compare/{a}-vs-{b} · /for/{audience} · /templates/{type} · /{city}-{service}- Each: unique H1 + meta desc + 800+ unique words + 1 unique image + 3+ internal links + 1+ outbound citation. Cap 200 pages per axis.
- Per
rules/copy-writing.md § pSEO + rules/thin-source-amplification.md.
GEO / AI search
- Quotable answer blocks 40-60 words (LLM citation magnet); FAQPage schema highest AI-citation rate (ChatGPT / Perplexity / Google AI Overviews)
- JSON-LD facts MUST also appear as visible HTML body text; lead paragraphs answer query in <40 words
- EEAT: author bio +
Person schema + sameAs + dated revision + ownership statement
llms.txt at site root (DX-only, <0.3% adoption — not build gate)
Local-business conversions + CRO
Track per local-conversions.md: phone_click (tel:) · direction_click (Google Maps) · form_submit · booking_click (Calendly/Cal.com) · chat_click · review_click (Google Business/Yelp). Each fires PostHog + Sentry breadcrumb + (Tier 2) GA4 conversion event.
CRO: sticky CTA bar on mobile · scroll-progress bar (subtle) · exit-intent modal (cart/pricing only, not blogs) · social proof near every CTA · urgency without dark patterns ("3 spots left this week" if true) · trust strip above fold · single primary CTA per surface.
Incident auto-remediation
Sentry → Inngest pipeline: (1) Sentry webhook on event.alert.triggered → (2) Inngest dispatches incident-responder agent → (3) agent reads event, traces to source file, proposes fix, opens PR via gh MCP → (4) PR auto-merges if all CI gates pass per rules/ai-seniority.md.
See submodules: posthog, ga4-gtm, sentry, stripe-billing, square-payments, listmonk, plg-framework, programmatic-seo, incident-remediation, geo-ai-search, local-conversions.
