What is the benefit of using the Rsyslog Sidecar?

https://www.ibm.com/docs/en/cpfs?topic=operator-architecture-audit-logging-version-370

Rsyslog is an open-source software utility for forwarding log messages in an IP network. It can act as a centralized log server and can also be used as a sidecar in a Kubernetes environment. The Rsyslog sidecar can be used to provide easier adoption of audit logging by shifting the burden of transmitting log messages to the sidecar. This allows for a more streamlined process for implementing audit logging within a Kubernetes environment.