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Fluent Bit

Fluent Bit is a CNCF, Apache-2.0 fast and lightweight processor for logs, metrics and traces on Linux, BSD, macOS and Windows, used widely as a Kubernetes log shipper.

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Introduction

Fluent Bit is a fast and lightweight telemetry agent for logs, metrics and traces. It is part of the Fluentd ecosystem under the CNCF and is commonly deployed as a DaemonSet to collect container logs in Kubernetes.

The source code is at fluent/fluent-bit on GitHub under the Apache-2.0 licence, with about 8,200 stars; the most recent commit was on 10 November 2026.

Features

  1. Lightweight: Small memory footprint, written in C.
  2. Inputs and outputs: Many plugins for sources and destinations.
  3. Processing: Parsing, filtering and enrichment.
  4. OpenTelemetry support: OTLP input and output.
  5. Kubernetes metadata: Enrich logs with pod labels.

Pros

  1. Free to use: Open source under Apache-2.0.
  2. Maintained: Commits as recent as 10 November 2026.
  3. Community: About 8,200 GitHub stars.

Cons

  1. Config complexity: Pipelines can get complex.
  2. Limited transformations: Heavier processing may suit Vector or Fluentd.
helm repo add fluent https://fluent.github.io/helm-charts
helm install fluent-bit fluent/fluent-bit

Resources:

Pricing

Fluent Bit is free and open source under the Apache-2.0 licence.

  1. Kubernetes teams shipping logs.
  2. Edge and IoT with tight resources.
  3. Not a fit as a storage backend.

Conclusion

Fluent Bit is the lightweight standard for collecting and shipping telemetry.

Alternatives

Other tools on CheckOps that cover similar ground. Open a page, or compare one with Fluent Bit side by side.