Rsyslog is a rocket-fast system for log processing. It offers
high-performance, great security features and a modular design. While it
started as a regular syslogd, rsyslog has evolved into a kind of swiss army
knife of logging, being able to accept inputs from a wide variety of
sources, transform them, and output to the results to diverse destinations.
Rsyslog can deliver over one million messages per second to local
destinations when limited processing is applied (based on v7, December
2013). Even with remote destinations and more elaborate processing the
performance is usually considered "stunning".