v5.0.4

KNOWLEDGE BASE

Release Notes v5.0.4

Fluent Bit is a Fast and Lightweight Data Processor and Forwarder for Linux, BSD, Windows and macOS. We are proud to announce the availability of Fluent Bit v5.0.4.

This maintenance release improves network input flexibility, adds a health endpoint for HTTP ingestion, and tightens routing and forwarding behavior for production pipelines.

What’s new ?

Core

• router: bind route definitions to the exact input section that owns them, avoiding accidental cross-routing when inputs share plugin names or omit aliases
• http_client: restore support for dummy HTTP clients while preserving the v5.0 shared network setup behavior
• multiline: register REGEX parser context consistently and keep metadata handling safe when multiline records are truncated
• utils: fix a Windows x64 integer overflow path in human-readable byte formatting
• tests: expand integration and runtime coverage for TCP, UDP, HTTP health checks, routing, Forward metadata retention, Lua startup flushing, multiline parsing, and InfluxDB tag keys

Plugins

• HTTP (Input)
  • add an optional GET /health endpoint so load balancers and orchestrators can check HTTP input readiness directly
• TCP (Input)
  • add parser support for line-delimited records, making TCP ingestion easier for JSON and other structured payloads
  • preserve the source address field on exception paths when source_address_key is configured
• UDP (Input)
  • add parser support for line-delimited records, bringing UDP behavior in line with other structured ingestion paths
• Forward (Output)
  • apply retain_metadata_in_forward_mode from upstream node configuration, so forwarded records can keep metadata as configured
• InfluxDB (Output)
  • fix tag_keys configuration handling so space-separated tag key lists are parsed as strings instead of booleans
• Dummy (Input)
  • move flush_on_startup collection into the pre-run phase to avoid startup crashes
• Tail (Input)
  • remove redundant file status checks during event collection, reducing unnecessary work in busy tailing workloads

Join us

We want to hear about you, our community is growing, and you can be part of it!, you can contact us at:

• Github: http://github.com/fluent/fluent-bit
• Slack: CNCF Slack, channel #fluent-bit (https://communityinviter.com/apps/cloud-native/cncf)
• Twitter: @fluentbit