Will your MongoDB upgrade break? Check it with UCFM - Percona

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You were assigned one of the most common, yet feared, tasks in the life of a database administrator:
Upgrades are needed for many reasons, whether to fix an existing bug or to keep the environment under support and eligible to receive security fixes. Either way, the task is yours.
The binary swap is the easy part. The hard part is everything before it:
A major upgrade in MongoDB moves one release at a time, regardless of the jump you plan. For example: “Going from 6.0 to 8.0”
So the homework is not done once. It is done per step, and for every step the checklist looks something like this:
None of this is hard per se. It is just long, tedious, easy to get wrong, and different for every version step. And there was no single command that answered the real question:
Is this deployment ready for the upgrade? If not, what should I fix first?
UCFM (Upgrade Checker For MongoDB) tells you whether a MongoDB or Percona Server for MongoDB deployment is ready to upgrade, and what to fix first.
If you have worked with MySQL, the idea may sound familiar: That’s because ucfm is heavily inspired by MySQL Shell’s upgrade checker, util.checkForServerUpgrade().
MySQL DBAs have had that answer for years.
The value is not in any single check. It is in having one place that knows every change between two versions, applies all of them to your deployment, and gives you a short list of things to fix.