Which issue(s) this PR fixes:
Fixes #

What this PR does / why we need it:
When I read 10 GB file using in_tail plugin, it calls Yajl methods many times when it stores to buffer file.

Recently, Ruby's JSON has huge improvement and it is much faster.
Ref. https://byroot.github.io/ruby/json/2024/12/15/optimizing-ruby-json-part-1.html

• Before

  • It spent 88.533409329 sec to handle 10 GB file

• After

  • It spent 72.324643557 sec to handle 10 GB file

• config

<source>
  @type tail
  path /home/watson/prj/sandbox/fluentd/log/access*.log
  pos_file /home/watson/prj/sandbox/fluentd/log/access.log.pos
  tag log
  read_from_head true
  follow_inodes true
  # rotate_wait 0
  refresh_interval 5
  # open_on_every_update true
  <parse>
    @type none
  </parse>
</source>

<match **>
  @type file
  path /home/watson/prj/sandbox/fluentd/log/log
</match>

Docs Changes:

Release Note: