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Config: Inject Section

Inject section overview

The inject section can be under <match> or <filter> section. It is enabled for the plugins that support injecting values to the event record.
@type file
# ...
# ...


time_key fluentd_time
time_type string
time_format %Y-%m-%dT%H:%M:%S.%NZ
tag_key fluentd_tag
Event Record:
tag: test
time: 1547575563.952259
record: {"message":"hello"}
Injected Record:

Inject Section Parameter

Inject Parameters

  • hostname_key (string) (optional): the field name to inject hostname
    • Default: nil
  • hostname (string) (optional): hostname value
    • Default: Socket.gethostname
  • worker_id_key (string) (optional): the field name to inject
    • Default: nil
  • tag_key (string) (optional): the field name to inject tag
    • Default: nil
  • time_key (string) (optional): the field name to inject time
    • Default: nil

Time Parameters

  • time_type (enum) (optional): parses/formats value according to this
    • Default: float
    • Available values:
      • float: seconds from Epoch + microseconds (e.g.
      • unixtime: seconds from Epoch (e.g. 1510544836)
      • unixtime_millis (since v1.11.4): milliseconds from Epoch
        (e.g. 1510544836154)
      • unixtime_micros (since v1.20.0): microseconds from Epoch
        (e.g. 1510544836154709)
      • unixtime_nanos (since v1.20.0): nanoseconds from Epoch
        (e.g. 1510544836154709804)
      • string: use format specified by time_format, local time or time
  • time_format (string) (optional): processes value according to the
    specified format. This is available only when time_type is string.
    • Default: nil
    • Available time format:
      • For more details about formatting, see
      • For more details about parsing, see
      • %iso8601 (only for parsing)
      • Use %N to parse/format with sub-second precision, because
        strptime does not support
        %3N, %6N, %9N, and %L.
  • localtime (bool) (optional): if true, uses local time. Otherwise,
    UTC is used. This is exclusive with utc.
    • Default: true
  • utc (bool) (optional): if true, uses UTC. Otherwise, local time is
    used. This is exclusive with localtime.
    • Default: false
  • timezone (string) (optional): uses the specified timezone. One can
    parse/format the time value in the specified timezone format.
    • Default: nil
    • Available time zone format:
      1. 1.
        [+-]HH:MM (e.g. "+09:00") (recommended)
      2. 2.
        [+-]HHMM (e.g. "+0900")
      3. 3.
        [+-]HH (e.g. "+09")
      4. 4.
        Region/Zone (e.g. Asia/Tokyo)
      5. 5.
        Region/Zone/Zone (e.g. America/Argentina/Buenos_Aires)
If this article is incorrect or outdated, or omits critical information, please let us know. Fluentd is an open-source project under Cloud Native Computing Foundation (CNCF). All components are available under the Apache 2 License.