DEVOPS
Web Vitals Lighthouse Gate on Preview Deploys
Runs a Lighthouse audit against each new Vercel preview URL, compares LCP, CLS, INP, and TBT to thresholds.
How it runs
The automated pipeline, trigger to output.
- TriggerVercel preview deployment readyVercel
- ActionRun Lighthouse audit on preview URLBrowserbase
- LogicCompare LCP/CLS/INP/TBT to thresholds
- ActionWrite GitHub check run with resultsGitHub
- OutputPost regression deltas to SlackSlack
What it does
Measures real Core Web Vitals on every preview deployment and gates promotion on them. After Vercel publishes a preview URL, the workflow drives a headless browser to run a Lighthouse-style audit, scores LCP, CLS, INP, and TBT against your thresholds, and reports back as a GitHub check so regressions can't be merged silently.
When to use it
Reach for this when bundle size alone misses the picture and you want field-relevant performance metrics enforced per PR. Good for marketing and conversion pages where Web Vitals affect SEO and revenue.
How it works
- 1A Vercel deployment-ready webhook delivers the new preview URL.
- 2A browser automation step loads the URL and captures Web Vitals via a Lighthouse run.
- 3A logic step compares each metric to its threshold and records which failed.
- 4It writes a GitHub check run with the metric table in the summary.
- 5If any metric regressed, it posts the before/after numbers to Slack for the team.
Set it up
What you configure once, before turning it on.
- 1Connect VercelDeploys, runtime logs, analytics.
- 2Connect BrowserbaseHeadless browsers, sessions, replays.
- 3Connect GitHubRepos, issues, pull requests, actions.
- 4Connect SlackChannels, DMs, threads, mentions.
- 5Set each agent's modelWe leave models unset so you pick the tier — fast + cheap, or top-quality.
- 6Tune it to your dataEdit the prompts, filters, and field mappings so it matches how your team works.
- 7Test, then turn it onRun once against a sample, confirm the output, then enable the trigger.
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