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https://metadata.ftp-master.debian.org/changelogs/main/p/poppler/poppler_22.12.0-2_changelog contains the changelog for this particular package. It should be obvious how to change to a different version or a different package. For example, https://metadata.ftp-master.debian.org/changelogs/main/e/emacs contains all the changelogs for the `emacs` package.

There is also https://tracker.debian.org/pkg/poppler which contains a lot of developer information for this particular package.

https://serverfault.com/questions/174737/how-do-i-see-the-changelog-for-a-debian-ubuntu-deb-package contains several command-line solutions. The most straightforward is the `apt changelog` command;

```
apt changelog emacs
```

(This particular command does not work for the `poppler` package at the moment; dunno what's with that.)