We've just released the new version of Observium CE, 18.9. This release is based on SVN revision 9411 and includes 552 separate commits covering ~50k changed lines of code since the previous release.
The new release can be downloaded from http://www.observium.org and upgrade instructions are at http://www.observium.org/docs/updating/#upgrade-to-latest-major-release
Changelogs are :
https://docs.observium.org/changelog/
http://www.observium.org/svn.log
Thanks,
adam.