Having read through the discussion in this bug report, I understand why persistent journald logging isn't enabled in Jessie or Stretch (both of which I've started using recently), but it would perhaps be helpful to users coming from other distros (in my case, Fedora) if there was more readily available documentation concerning this whole subject. I realize there's a document that covers this in /usr/share/doc/systemd/, but official Debian content available online would help. (Perhaps there is some, but if so, I couldn't find anything, only scattered blog posts. And relying upon Google to search for Debian bug reports is sub-optimal, in my experience.)
Dave