I just sync'd an artifact to Maven Central from oss.sonatype.org. Immediately after doing so, a problem was discovered (of course). I haven't announced the new artifact yet, it is very unlikely that anyone is using it yet, so I'd like to take it down before anyone starts using the broken version.
How can I remove a broken artifact from Maven Central?
Can't be done. It's A Rule. But if you want to try, contact the Sonatype people who support oss.sonatype.org. So you generally push a new, higher, version with the fix, and tell everyone to use it.