Fluent Bit is unclaimed —

Fluent Bit

The preferred choice for cloud and containerized environments.·fluentbit.io

Fluent Bit is a super fast, lightweight, and highly scalable logging, metrics, and traces processor and forwarder built for an end-to-end observability pipeline. It collects event data from any source, enriches it with filters, and routes it to any destination, with native OpenTelemetry (OTLP) support. It is designed for cloud, containerized, and hybrid environments and includes stream processing, buffering, and reliability features. It is a CNCF graduated project under the Fluent organization.

What it's for

Collecting logs, metrics, and traces from local files, network devices, and Prometheus-format sourcesEnriching and filtering telemetry data before deliveryRouting and forwarding data to multiple destinations such as Splunk, Elasticsearch, OpenSearch, and KafkaStream processing using SQL-like queriesMonitoring internal metrics via HTTP in JSON and Prometheus formatDisaster recovery via data buffering to avoid data loss during outages

Features 18

Aggregation windows for stream data
Asynchronous, event-driven I/O architecture
Backpressure handling
Built-in TLS/SSL support
Data buffering in memory and file system
Data parsing via JSON, Regex, LTSV, and Logfmt parsers
Dynamic routing with zero-copy data distribution
Internal metrics exposed over HTTP in JSON and Prometheus format
Log, metrics, and traces processing and forwarding
Native OpenTelemetry (OTLP) ingestion and delivery
Over 100 built-in plugins
Pluggable architecture for Inputs, Filters, and Outputs
Robust I/O handler for high-scale read/write operations
Stream processing using basic SQL queries
Time series forecasting / data analysis and prediction
Upstream Manager for TCP connection handling
Wasm filter and input plugins
Write filters in Lua or output plugins in Golang

At a glance

free tieropen sourceself-hostable

DeploymentSelf-hosted

PlatformsLinux, macOS, Windows

Integrations

SplunkElasticsearchOpenSearchKafkaKubernetesPrometheusOpenTelemetryStackdriverCloudWatch Logs

Resources

Pricing

No pricing plans are listed on the site; Fluent Bit is distributed as open source software (Apache License v2.0) and can be downloaded freely. An 'Enterprise' link exists but no pricing details are given.