Syslog - Facility

• numerical indicator (0..23) of sender component/application that sent the message

• Each of the values is assigned a friendly name

• For example, on Unix systems, facility 0 is traditionally used for kernel messages, 2 for mail subsystem messages, and values 16-23 are reserved for local customization.

• Other implementations may use it differently.

• In general: a more-or-less user-assigned value to be used for filtering at the server side.