Syslog Decoder Module

1. Decoder Configuration Table

decoders_syslog = {
  -- template (string) - The 'template' configuration string from rsyslog.conf
  -- see
  -- see
  -- Default:
  -- template = "<%PRI%>%TIMESTAMP% %HOSTNAME% %syslogtag:1:32%%msg:::sp-if-no-1st-sp%%msg%", -- RSYSLOG_TraditionalForwardFormat

  -- printf_messages = nil, -- see:
  -- sub_decoders = nil, -- see:

2. Functions

2.1. decode

Decode and inject the resulting message


  • data (string) - syslog message
  • default_headers (table/nil/none) - Heka message table containing the default header values to use, if they are not populated by the decoder. If 'Fields' is specified it should be in the hashed based format see: In the case of multiple decoders this may be the message from the previous input/decoding step.
  • mutable (bool/nil/none) - Flag indicating if the decoder can modify the default_headers/msg structure in place or if it has to be copied first.


  • err (nil, string) or throws an error on invalid data or an inject message failure
    • nil - if the decode was successful
    • string - error message if the decode failed (e.g. no match)

source code: syslog.lua

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