🎨 Improved otel code, cleaned up cjs polyfills

[acburdine]

ref https://linear.app/ghost/issue/PLA-280/optimize-traffic-analytics-docker-buildself-hosting-execution

• remove unused cjs polyfills, only referenced in a few spots that don't affect running behavior
• fix otel tracing for pubsub + fastify
• remove blanket node auto otel registration in favor of lighter-weight individual plugins

[coderabbitai]

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Review details

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: af50bc95-05c6-4010-8300-ccac7d7d900a

📥 Commits

Reviewing files that changed from the base of the PR and between 23bc810 and c4de090.

⛔ Files ignored due to path filters (1)

• yarn.lock is excluded by !**/yarn.lock, !**/*.lock

📒 Files selected for processing (2)

• package.json
• vite.config.ts

Walkthrough

The project replaces automatic Node instrumentation with explicit HTTP and Undici packages, adds Fastify OpenTelemetry integration, and ignores selected health and informational paths. Both application variants register tracing before other plugins and routes, while Pub/Sub clients enable tracing. Server startup now uses dynamic application imports and import.meta.main.

Estimated code review effort: 3 (Moderate) | ~20 minutes

Suggested reviewers: cmraible, joeegrigg

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title accurately reflects the main changes: OpenTelemetry improvements and removal of CJS polyfills.
Description check	✅ Passed	The description is directly related to the PR changes, covering CJS polyfills and OpenTelemetry tracing updates.
Docstring Coverage	✅ Passed	Docstring coverage is 100.00% which is sufficient. The required threshold is 80.00%.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feat/docker-optimize

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[coderabbitai]

Actionable comments posted: 1

🤖 Prompt for all review comments with AI agents

Verify each finding against current code. Fix only still-valid issues, skip the
rest with a brief reason, keep changes minimal, and validate.

Inline comments:
In `@src/utils/instrumentation.ts`:
- Around line 30-34: Correct the service-name selection expression in the
instrumentation initialization so K_SERVICE is used when present, otherwise the
worker name is selected only when WORKER_MODE is strictly enabled, matching the
check in server.ts. Preserve the existing service-name values while fixing the
operator precedence that currently classifies every Cloud Run deployment as
analytics-worker.

🪄 Autofix (Beta)

Fix all unresolved CodeRabbit comments on this PR:

• Push a commit to this branch (recommended)
• Create a new PR with the fixes

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: ba60ce69-caab-4a41-a745-2c38b269a2ca

📥 Commits

Reviewing files that changed from the base of the PR and between 40cdf91 and 23bc810.

⛔ Files ignored due to path filters (1)

• yarn.lock is excluded by !**/yarn.lock, !**/*.lock

📒 Files selected for processing (9)

• package.json
• server.ts
• src/app.ts
• src/services/events/publisher.ts
• src/services/events/subscriber.ts
• src/utils/cjs-polyfill.ts
• src/utils/fastify-otel.ts
• src/utils/instrumentation.ts
• src/worker-app.ts

💤 Files with no reviewable changes (1)

• src/utils/cjs-polyfill.ts

[acburdine]

NOTE: we'll need to remove the required node 20 check before this can be merged.

[cmraible]

FYI: Just rebased, resolved conflicts and force-pushed so I can deploy this to staging to test

[cmraible]

NOTE: we'll need to remove the required node 20 check before this can be merged.

This is done — I've also pulled out the change to remove node 20 from the CI matrix into its own PR and merged it.

[github-actions]

✅ Deployed to staging (tree: 1f226d4b88dbddb0ea110a2cf987c1ac93b5cd77)