I also see that too and it's really annoying as it prevents many workflows from working, so many work from being completed!
In the meantime, you can try as workaround to use GitHub mirror: create a GitHub fork from https://github.com/eclipse/eclipse.jdt.core
, and push you local commits to your fork. When Gerrit is back to life, you'll simply have to push the branch or commits you want to it. Then you can put a link from Bugzilla to your GitHub commit so your patch is accessible from the related ticket.
That's far from being perfect, but at least it already allows to share the code and prepare it at best.