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tl;dr: Check this pull request to see if your package was just removed from Stackage Nightly.
Stackage Nightly maintains a set of upper bounds to give package maintainers a grace period between dependencies updating their APIs and users needing to support the new versions. Keeping these upper bounds in place indefinitely places a burden on the rest of the ecosystem needing to keep support for older versions of packages. Therefore, the Stackage Curator team will periodically drop these upper bounds, and in the process must temporarily drop some packages.
Over the years, we've standardized on doing this drop immediately following the release of a new major version of LTS Haskell. This allows maximum packages to be included in an LTS release without imposing "bleeding edge" requirements (something LTS Haskell tries to avoid doing).
And as you may have guessed: I'm writing this now since I just dropped a bunch of upper bounds and blocked a number of packages on Stackage Nightly :). If you'd like to see if your package was evicted, please check out the relevant pull request. Some notes:
Once dependencies are fixed, please send pull requests to reenable packages. Everyone is welcome to do so, whether you're unblocking your own package or someone else's.
PS: Merry Christmas to all those celebrating today.