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Syslog Level Mapping

Gelf requires a syslog level that is an integer. There are several ways how to determine that. log4j, for example, has a built-in mapping. To keep the style consistent over various logging frameworks this is the way how it works:

log4j2

Resolution of the syslog level is based on the StandardLevel property of the log level:

  • FATAL: 2
  • ERROR: 3
  • WARN: 4
  • INFO: 6
  • Everything else: 7

log4j 1.2, JUL, JBoss Logging, Logback

These frameworks provide an integer representation of the log level value:

  • Level greater FATAL: 0
  • Level is less or equal to FATAL: 2
  • Level is greater to SEVERE: 2
  • Level is greater to ERROR: 2
  • Level is less or equal to ERROR or SEVERE: 3
  • Level is less or equal to WARN: 4
  • Level is less or equal to INFO: 6
  • Level is less or equal to CONFIG/DEBUG: 7