Who merges so late, past midnight's chime, still pushing bugs to master's line?
Every fix in this series landed at a different layer — application code, shared plugin, edge config, vendor dashboard. The scoping decision matters more than the fix itself, and it’s rarely obvious from the bug report.
An index that fixes one site’s slow query has a write cost paid by every site sharing that database tier. A checklist for deciding whether a covering index actually pays for itself, before adding it.
Two separate incidents on the same network turned out to be the same root cause wearing different clothes: a cache key that let the request decide what it means, instead of the other way around.