Goodbye, Universal Analytics: the GA4 migration

Google has given Universal Analytics a death date. On the first of July, 2023, the analytics product that practically every small business website runs on will stop processing data. Not deprecated, not maintenance mode. Stopped. Its replacement is Google Analytics 4, and if you have opened GA4 expecting to find your old reports, you already know why everyone I work with is quietly panicking.

I have set up Universal Analytics on more sites than I can count, usually through a plugin, usually in ten minutes, usually never touched again. That set-and-forget culture is exactly what is about to break. This migration is not a version bump. It is a different product with a different data model wearing the same brand.

Sessions become events

Universal Analytics sees the world as sessions and pageviews. A visit starts, pages get viewed, goals get hit, the visit ends. GA4 throws that out. In GA4 everything is an event: a pageview is an event, a click is an event, a scroll is an event, a conversion is an event with a checkbox. Sessions still exist, but they are computed differently, so the numbers will not match your old ones.

Bounce rate, the metric every small-business owner learned to fear, is gone, replaced by engagement rate, which is roughly its mirror image with new definitions underneath. Views, the workhorse of old Analytics setups, do not exist; you get properties and data streams instead. Custom reports become Explorations. Almost nothing maps one to one.

None of this is malicious. The event model honestly fits how people use the web now, across apps and sites and devices, and the privacy pressure on measurement is real. But better architecture is cold comfort when your dashboard holds years of history in one shape and the future arrives in another.

Year over year is about to break

Here is the part that surprises every client: GA4 does not import your Universal Analytics history. There is no merge button. Your GA4 property starts collecting from the day you create it, and your UA data stays behind in the old product, readable for at least six months after the sunset and then headed for the archive in the sky. Export what you care about while you can.

Practically, that means every year-over-year comparison breaks at the seam. Even after you migrate, comparing this July to last July means comparing GA4 events to UA sessions, which is comparing apples to a photograph of oranges. The only fix is time: the sooner your GA4 property starts collecting, the sooner you own a clean year of history.

The migration list I am walking every site through is short and boring, which is how I like migrations:

• Create the GA4 property now, even if you keep reading UA reports, so history starts accruing
• Run both in parallel until the sunset; dual tagging is fully supported
• Rebuild every UA goal as a GA4 conversion event, and test that each one actually fires
• Raise the data retention setting from the two-month default to fourteen months
• Export the UA reports you actually reference: monthly traffic, top pages, top sources

Own your setup

The bigger lesson sits underneath the tooling. Analytics has been treated like plumbing: installed once by whoever built the site, through whatever plugin was handy, then trusted forever. Half the small businesses I look at cannot tell me where their tracking code lives or what counts as a conversion. It never mattered, until the day the plumbing got scheduled for demolition.

Measurement is a thing you own, not a thing you set. Know where the tag is, know what it fires, know what a conversion means in your business and confirm the tool agrees. And if an agency set it up for you, ask for admin access on your own analytics account today; you would be amazed how many businesses do not have it.

I do not love everything about GA4 yet. The interface buries simple questions, and small-business owners want "how many people called me" rather than an Exploration canvas. But the deadline is not negotiable, the data gap grows every week you wait, and the businesses that treat this as ownership homework instead of a chore will come out the other side actually understanding their numbers for the first time.