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Last updated criteria

ability to configure backup syslog/database servers

Yes/No
Professional Support

Yes/No
Config File

Header
config file format

Text
ability to include config file from within other config files

Yes/No
ability to include all config files existing in a specific directory

Yes/No
Extensibility

Header
Functionality split in separately loadable modules

Yes/No
Support for third-party input plugins

Yes/No
Support for third-party output plugins

Yes/No
Other Features

Header
ability to generate file names and directories (log targets) dynamically

Yes/No
control of log output format, including ability to present channel and priority as visible log data

Yes/No
native ability to send mail messages

Yes/No
good timestamp format control; at a minimum, ISO 8601/RFC 3339 second-resolution UTC zone

Yes/No
ability to reformat message contents and work with substrings

Yes/No
support for log files larger than 2gb

Yes/No
support for log file size limitation and automatic rollover command execution

Yes/No
support for running multiple syslogd instances on a single machine

Yes/No
ability to execute shell scripts on received messages

Yes/No
ability to pipe messages to a continously running program

Yes/No
massively multi-threaded for tomorrow's multi-core machines

Yes/No
ability to control repeated line reduction ("last message repeated n times") on a per selector-line basis

Yes/No
supports multiple actions per selector/filter condition

Yes/No
web interface

Text
using text files as input source

Yes/No
rate-limiting output actions

Yes/No
discard low-priority messages under system stress

Yes/No
flow control (slow down message reception when system is busy)

Yes/No
rewriting messages

Yes/No