Library modules provide dynamically loadable functionality for parts of rsyslog, most often for other loadable modules. They can not be user-configured and are loaded automatically by some components. They are just mentioned so that error messages that point to library modules can be understood. No module list is provided.
Help with configuring/using
Mailing list - best route for general questions
GitHub: rsyslog source project - detailed questions, reporting issues that are believed to be bugs with
Stack Exchange (View, Ask) - experimental support from rsyslog community
Source project: rsyslog project README.
Documentation: rsyslog-doc project README
Copyright 2008-2020 Rainer Gerhards (Großrinderfeld), and Others.