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in_kmsg: align fields with syslog input plugin #10544

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@mhusaam mhusaam commented Jul 4, 2025

if we want to write both the kernel logs and system logs to
/var/log/messages then we don't have to use separate templates

Fluent Bit is licensed under Apache 2.0, by submitting this pull request I understand that this code will be released under the terms of that license.

Summary by CodeRabbit

  • New Features
    • Log events now include a syslog-style timestamp, an "ident" field set to "kernel", and a "message" field with the original log message.
    • The previous "msg" field has been replaced by these three new fields for improved log clarity.

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coderabbitai bot commented Aug 5, 2025

Walkthrough

A syslog-style timestamp string is generated from the kernel message timestamp and system boot time, converted to local time, and formatted. The log event encoder output now replaces the original "msg" field with three fields: "ident" set to "kernel", "message" containing the original log message, and "time" containing the formatted timestamp.

Changes

Cohort / File(s) Change Summary
Kernel Message Timestamp Formatting
plugins/in_kmsg/in_kmsg.c
Generates a syslog-style timestamp from kernel message time and boot time, formats it, and replaces the original "msg" field with "ident", "message", and "time" fields in the log event output.

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A kernel log with time anew,
Now prints the hour, minute too.
"Jul 03 10:31:53" in view,
Syslog style, precise and true.
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@mhusaam mhusaam changed the title in_kmsg: add a field for syslog timestamp in_kmsg: align fields with syslog input plugin Aug 5, 2025
- a syslog like timestamp can be very human friendly for kernel
  messages, instead of only having monotonic timestamp
- if we want to write both the kernel logs and system logs to
  /var/log/messages then we don't have to use separate templates

Signed-off-by: Mohd Husaam Mehdi <[email protected]>
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