Fluent Bit is a Fast and Lightweight Log Processor, Stream Processor and Forwarder for Linux, OSX, Windows and BSD family operating systems. It has been made with a strong focus on performance to allow the collection of events from different sources without complexity.

• High Performance
• Data Parsing
  • Convert your unstructured messages using our parsers: JSON, Regex, LTSV and Logfmt
• Reliability and Data Integrity
  • Backpressure Handling
  • Data Buffering in memory and file system
• Networking
  • Security: built-in TLS/SSL support
  • Asynchronous I/O
• Pluggable Architecture and Extensibility: Inputs, Filters and Outputs
  • More than 50 built-in plugins available
  • Extensibility
    • Write any input, filter or output plugin in C language
    • Bonus: write Filters in Lua or Output plugins in Golang
• Monitoring: expose internal metrics over HTTP in JSON and Prometheus format
• Stream Processing: Perform data selection and transformation using simple SQL queries
  • Create new streams of data using query results
  • Aggregation Windows
  • Data analysis and prediction: Timeseries forecasting
• Portable: runs on Linux, MacOS, Windows and BSD systems

Fluent Bit is a sub-component of the Fluentd project ecosystem, it's licensed under the terms of the Apache License v2.0. This project was created by Treasure Data and is its current primary sponsor.

Nowadays Fluent Bit get contributions from several companies and individuals and same as Fluentd, it's hosted as a CNCF subproject.