The migration is done. Who is taking the alerts tomorrow?

I think technical projects get judged too heavily on the day they go live.

A service moves to Kubernetes. A company switches cloud providers. A virtualization migration finishes. Everybody checks that the application loads, writes up the handoff and considers the project complete. Fair enough. But the next six months are where the quality of the work becomes obvious.

Who responds when a deployment fails? Who rotates the credentials? Who notices that backups stopped running? Who updates the environment when a dependency is no longer supported? If those answers are unclear, the company has inherited a system, not an operational capability.

Make the handoff usable by the people who actually work there

I would rather see a short runbook that someone can follow under pressure than a beautiful architecture deck. Show how to restart the application, where the logs are, how to recover the data and how to back out a bad release. Test those instructions with somebody who did not build the environment.

For smaller organizations, there is another perfectly reasonable option: keep the same technical partner around to own the maintenance and incident work. That can be much simpler than recruiting an entire specialty team for an environment that does not need full-time attention every day.

The job is not really done when the new environment starts running. It is done when the company is comfortable living with it.

What I would want before calling it finished

I'd want a named owner for alerts, a clear update schedule and a short document showing how to do the routine things. Add a user, expand storage, find logs, recover a service, replace a certificate. If those operations are a mystery, the migration probably wasn't finished from the business's perspective.

Then there's the awkward handoff between teams. The person who planned the move may know exactly why the firewall rules look strange or why one service has an unusual startup sequence. The people on call next month may not. Writing down those decisions is boring, but it prevents the next engineer from having to rediscover them at 2 a.m.

I like ongoing support arrangements for this reason. They let the same people who built or changed an environment stick around long enough to see what happens under normal use. Otherwise, the client can end up with a technically completed migration and a new set of problems nobody agreed to own.