Hi @sven.schatter, we had a release pipeline issue for 2.1.9 where only the parent POM got sync’d to Maven Central. It should be fixed within a day or two.
Regarding the release announcements here on the Developer Community, I only posted them to give higher-impact releases an extra push. Since 2.1.0, there was an implicit announcement of 2.1.5 in Action required: Atlassian Connect vulnerability allows bypass of app qsh verification via context JWTs). We will try to post more of these in the future 