Reduce the size of the UUID Lookup Length restriction from `8` to `2`.
Reduce the size of the UUID Lookup Length restriction from `8` to `2`.

I'm torn on this.  It's useful from a UX perspective for an operator to
be able to type in something that's short.  At the same time, by
enforcing an `8` character length, we reduced the probability of a user
depending on the behavior and having it suddenly stop working in the
future when a duplicate prefix is injected into the environment.

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