Fluent Bit is an open source telemetry agent that processes logs, metrics, traces, and profiles. It's designed to efficiently handle the challenges of collecting and processing telemetry data across a wide range of environments, from constrained systems to complex cloud infrastructures. Managing telemetry data from various sources and formats can be a constant challenge, particularly when performance is a critical factor. Rather than serving as a drop-in replacement, Fluent Bit enhances the observability strategy for your infrastructure. It adapts and optimizes your existing logging layer, and adds metrics and traces processing. Fluent Bit supports a vendor-neutral approach, with native OpenTelemetry (OTLP) ingestion and delivery and seamless integration with ecosystems such as Prometheus. Trusted by major cloud providers, banks, and companies that need a ready-to-use telemetry agent, Fluent Bit effectively manages diverse data sources and formats. It maintains optimal performance while keeping resource consumption low. Fluent Bit can be deployed as an edge agent for localized telemetry data handling or utilized as a central aggregator/collector for managing telemetry data across multiple sources and environments.
What's new in 5.1.5
https://fluentbit.io/announcements/v5.1.5/ What's Changed - api: v2: trace: plug leaks on trace requests with duplicated parameters by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12569 - workflows: bump ossf/scorecard-action from 2.4.4 to 2.5.0 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12578 - workflows: bump reviewdog/action-actionlint from 1.80.0 to 1.80.1 by @dependabot[bot] in https://github.com/fluent/fluent-bit/pull/12588 - release: update to 5.1.5 by @github-actions[bot] in https://github.com/fluent/fluent-bit/pull/12591 - tests: runtime: out_http: push JSON format records together by @edsiper in https://github.com/fluent/fluent-bit/pull/12600 - router: apply input routes with a single input and output by @edsiper in https://github.com/fluent/fluent-bit/pull/12596 - out_cloudwatch_logs: fix log stream leak when group allocation fails by @ParakhJaggi in https://github.com/fluent/fluent-bit/pull/12257 - in_nginx_exporter_metrics: mitigate nginx plus response type confusion by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12609 - lua: bound MessagePack reads when pushing values to Lua by @edsiper in https://github.com/fluent/fluent-bit/pull/12597 - in_forward: mitigate forward trace decoding bypasses by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12615 - http_server: address cumulative bytes on http2 headers by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12590 - opentelemetry: in_opentelemetry: log_event_encoder: mitigate otel attributes quadratic encoding expansion by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12603 - oauth2_jwt: mitigate leaks on duplicated JWT members by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12605 - out_chronicle: add support for the Chronicle API by @cozybear-dev in https://github.com/fluent/fluent-bit/pull/12548 - http_client: out_loki: Mitigate crlf injection on HTTP headers by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12613 - filter_kubernetes: mitigate SEGV occurrences on using Use_Kubelet by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12580 - out_http: add PATCH as an http method by @cestercian in https://github.com/fluent/fluent-bit/pull/12552 - out_stackdriver: out_bigquery: out_chronicle: conceal jwt token on debug logs by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12604 - in_collectd: mitigate collectd unaligned type read by @cosmo0920 in https://github.com/fluent/fluent-bit/pull/12606 …
Yes. fluent-bit is free and open-source software released under the Apache-2.0 license.
What is the latest version of fluent-bit?
The latest version is 5.1.5, released on Oct 21, 2026.
Is it safe to download fluent-bit?
The download button links to the official installer published on packages.fluentbit.io, the same file Windows Package Manager installs. You can verify the downloaded file by comparing its SHA-256 checksum with cce1d2f5a340e42072c3873157a60fcd853431f25da4430a6713b99f7b2c2272.
Which Windows versions does fluent-bit support?
fluent-bit runs on Windows and is available for 32-bit (x86), 64-bit (x64), ARM64 systems.
How do I install fluent-bit silently?
Run the offline installer with "fluent-bit-5.1.5-win64.exe" /S, or install it with Windows Package Manager: winget install --id=Chronosphere.FluentBit -e --silent.
How do I uninstall fluent-bit?
Open Settings › Apps › Installed apps, find fluent-bit and select Uninstall. From the command line, run winget uninstall --id=Chronosphere.FluentBit -e.
The Azure command-line interface (Azure CLI) is a set of commands used to create and manage Azure resources. The Azure CLI is available across Azure services and is designed to get you working quickly
