Upon start, rsyslog checks if it is running as pid 1. If so, this is a clear indication it is running inside a container. This changes some parameter defaults:
Control-C is enabled
no pid file is written
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.