rosdoc2, the utility used to generate ROS 2 package documentation via doc jobs. Is now available in the ROS package repositories for Ubuntu and Debian and on PyPI for other platforms*.
The ROS build farm currently installs the main branch of rosdoc2 rather than the current release, but we’ll likely switch to releases in the near feature.
Updated installation instructions are available in the project README.md.
*: If you install from PyPI please note that doxygen and graphviz are system dependencies that need to be manually installed