Syslog-ng is an enhanced log daemon, supporting a wide range of input and output methods: syslog, unstructured text, message queues, databases (SQL and NoSQL alike) and more.

Key features:

* receive and send RFC3164 and RFC5424 style syslog messages
* work with any kind of unstructured data
* receive and send JSON formatted messages
* classify and structure logs with builtin parsers (csv-parser(),
db-parser(), etc.)
* normalize, crunch and process logs as they flow through the system
* hand on messages for further processing using message queues (like
AMQP), files or databases (like PostgreSQL or MongoDB).
The new tags-parser() takes a value encoded by $TAGS and parses it back into actual tags on the message.