Short pieces from the practice. They are written for analytics leads and product owners who still ship an old client, not as general essays on “change”.
Store downloads keep arriving. Almost everything else — funnels, retention cohorts, even the meaning of a session — can fail silently if the destination build was instrumented from a vendor template.
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A cutover is a break in the series. You can still talk about the business, but you should stop pretending the line is continuous unless the identifiers and the event names survived.
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Vendor comparisons eat the calendar. The list of screens and the names they already have in the live app is the work that actually protects Monday’s report.
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They still ran a hybrid wrapper from 2018. Leadership wanted the new native clients compared with last year’s Ramadan campaign. The old campaign lived in event names nobody had listed.
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Not a vendor checklist. Five questions about identifiers, clocks, background events, and the screens that will still exist when the old binary is gone.
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