History

Origin

Fluentd was created in 2011 by Sadayuki "Sada" Furuhashi, a co-founder of Treasure Data, as an internal tool. The GitHub repository was created on 2011-06-19, and the project was open sourced in October 2011 (source 5). The goal was to unify log collection across many different data sources into one layer, which the project calls the "Unified Logging Layer" (source 3).

Timeline

Year	Milestone
2011	Created at Treasure Data; repository created 2011-06-19, open sourced in October
2016	Accepted into CNCF as an Incubating project (2016-11-08)
2019	Graduated from CNCF on 2019-04-11

How it evolved

Fluentd entered CNCF as an Incubating project on 2016-11-08, one of the early hosted projects alongside Kubernetes and Prometheus (source 4). It graduated on 2019-04-11, with more than 5,000 community users reported at that time (source 4).

A lighter sister implementation, Fluent Bit, was written in C and lives under the same fluent GitHub organization. Fluentd itself stays on Ruby and runs with a resident memory footprint in the tens of megabytes, while Fluent Bit targets edge and Kubernetes sidecar use where a sub-megabyte footprint matters (source 3).

Where it stands now

The current pinned source is master after the v1.19.2 release, with the version constant reading VERSION = '1.19.0' for the master development series (lib/fluent/version.rb:19). The project requires Ruby 3.2 or later (fluentd.gemspec:28) and is governed under the documented CNCF Graduated governance model. Development uses Bundler and Rake; the gem is published to RubyGems.