Having done distro-maintenance work that needed to be compatible with both systemd and upstart, I&#x27;ve read the explanatory blog posts and found them wonderful, and I&#x27;ve <i>also</i> found the detailed API documentation lacking in spots.<p>There are a lot of praiseworthy things about systemd and its approach to documentation. The blog posts are definitely one of them. That doesn&#x27;t mean everything is praiseworthy, that there&#x27;s no room for improvement, or that complaints about things not being documented are illegitimate or inappropriate.