Fluent Bit

Fluent Bit is an open source lightweight log processor and forwarder for collecting, parsing, and routing logs and metrics at scale. It exposes an embedded HTTP monitoring server with v1 and v2 endpoints for build info, uptime, internal metrics (JSON, Prometheus, cmetrics), storage stats, health checks, and hot reload.

Fluent Bit publishes 6 APIs on the APIs.io network, including Build API, Health API, Metrics API, and 3 more. Tagged areas include Logging, Observability, Metrics, and Open-Source.

Fluent Bit’s developer surface includes documentation, engineering blog, and 12 more developer resources.

🌐 Visit website 📡 Source on GitHub

33.6/100 thin ▬ flat Agent 20/100 agent aware self hosted · Apache-2.0 Full breakdown ↓
scored 2026-09-08 · rubric v0.20.0

AccessFreemium

1 APIs

Logging Observability Metrics Open-Source

Kin Score

Kin Score How this is scored →
scored 2026-09-08 · rubric v0.20.0

Composite quality — 33.6/100 · thin

Contract Quality 7.9 / 20

Developer Ergonomics 2.3 / 16

Access Clarity 2.5 / 16

Operational Transparency 4.1 / 10

Contract Governance 0.0 / 10

Discoverability 4.7 / 8

Open Source Surface 10.0 / 10

Create-or-Update Ergonomics 0.0 / 10

Agent readiness — 20/100 · agent aware

Machine-Readable Contract 18 / 18

Agentic Access Contract 10 / 10

Documented Reversibility 0 / 6

MCP Server 0 / 12

Machine-Readable Auth 0 / 10

Idempotency 0 / 9

Stable Error Semantics 0 / 8

Request/Response Examples 7 / 7

Rate-Limit Signaling 7 / 7

Typed Event Surface 0 / 6

Agent Skills 0 / 5

Well-Known Catalog 0 / 4

Consent & Bot Identity 0 / 3

A2A Agent Card 0 / 8

Dry-Run / Simulate Mode 0 / 4

Delegated User Identity 0 / 6

Protected Resource Metadata 0 / 5

Registration Without a Human 0 / 6

Agentic Commerce Well-Known Document 0 / 5

Open Source Surface applies to this provider. This product is open source and we read its repository directly, so Open Source Surface carries 10 points of the composite. It is scored from what the repository actually publishes — a security policy, a contribution guide, a release history, a code of conduct — read live from the provider rather than inferred from our own catalog pointers. This facet adds; nothing was taken away to make room for it. An open-source project is not excused from the commercial facets, because exemption would strip it of the points it does earn. If we have the wrong repository, or this product is not open source, say so on your provider repo and we will drop the facet rather than have you publish against it.

Create-or-Update Ergonomics applies to this provider. This API accepts writes, so it carries 10 points of the composite. It is scored from the published contracts themselves: whether a caller can create-or-update in one call, whether the write accepts a key the caller already holds, and whether the response says which branch ran. Without that, every write needs a search-and-branch in front of it, and the first time that check is skipped a duplicate record is created. Scored against the observed mean rather than raw — a provider at the catalog average is unchanged by this facet, not penalised by it.

The six quality facets above are damped to 80 points between them, because the conditional facet above carries the other 20. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 80% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. Every facet and dimension name above is a link: it opens that measurement's own page — what it means, the exact checks that feed it, how the whole catalog distributes on it, and the providers at the top of it. This rating is computed from github.com/api-evangelist/fluent-bit: open an issue to ask a question, or submit a pull request to add artifacts. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

APIs 6

Individual APIs this provider publishes, each with its own machine-readable definition.

Fluent Bit Build API

The Build API from Fluent Bit — 1 operation(s) for build.

Fluent Bit Health API

The Health API from Fluent Bit — 2 operation(s) for health.

Fluent Bit Metrics API

The Metrics API from Fluent Bit — 4 operation(s) for metrics.

Fluent Bit Reload API

The Reload API from Fluent Bit — 1 operation(s) for reload.

Fluent Bit Storage API

The Storage API from Fluent Bit — 1 operation(s) for storage.

Fluent Bit Uptime API

The Uptime API from Fluent Bit — 1 operation(s) for uptime.

Open Collections 8

Open, tool-agnostic API collections (OpenAPI-derived and Bruno).

API Collection

OPEN COLLECTION

Fluent Bit Monitoring HTTP Build API

OPEN COLLECTION

Fluent Bit Monitoring HTTP Build Health API

OPEN COLLECTION

Fluent Bit Monitoring HTTP Build Metrics API

OPEN COLLECTION

Fluent Bit Monitoring HTTP API

OPEN COLLECTION

Fluent Bit Monitoring HTTP Build Reload API

OPEN COLLECTION

Fluent Bit Monitoring HTTP Build Storage API

OPEN COLLECTION

Fluent Bit Monitoring HTTP Build Uptime API

OPEN COLLECTION

Scroll for all 8

Pricing Plans 1

Published pricing tiers and plan structures.

Fluent Bit Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fluent Bit Rate Limits

5 limits

RATE LIMITS

FinOps 1

Cost, billing, and metering signals for API financial operations.

Fluent Bit Finops

FINOPS

Security Posture 1

Authentication, domain security, vulnerability disclosure, and trust-center signals.

Fluent Bit Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

Recommended x-agentic-access execution contracts for AI agents.

Fluent Bit Agentic Access

12 operations · 2 acting

AGENTIC

Resources

Documentation 2

Reference material describing how the API behaves

ContributionGuide

ContributionGuide

Documentation

Documentation

Agent Surfaces 1

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess

AgenticAccess

Build 2

SDKs, sample code, and the tooling you integrate with

CodeOfConduct

CodeOfConduct

GitHubRepository

GitHubRepository

Access & Security 2

Authentication, authorization, and security posture

SecurityPolicy

SecurityPolicy

DomainSecurity

DomainSecurity

Operate 4

Status, limits, changes, and where to get help

IssueTracker

Releases

Slack

Community

Commercial 1

Pricing, plans, and the legal terms of use

License

License

Company 2

The organization behind the API

Website

Website

Blog

Blog

Source (apis.yml)

aid: fluent-bit
name: Fluent Bit
description: Fluent Bit is an open source lightweight log processor and forwarder for collecting, parsing, and routing logs
  and metrics at scale. It exposes an embedded HTTP monitoring server with v1 and v2 endpoints for build info, uptime, internal
  metrics (JSON, Prometheus, cmetrics), storage stats, health checks, and hot reload.
type: Index
deliveryModel:
  model: self-hosted
  license: Apache-2.0
  open_source: true
  commercial: false
  callable_host: false
  label: Self-hosted open source · you run it yourself
  confidence: high
  source:
  - license
  - openapi
  generated: '2026-08-28'
  method: derived
accessModel:
  pricing: freemium
  onboarding: unknown
  trial: false
  try_now: false
  public: false
  label: Freemium
  confidence: medium
  source:
  - plans
  generated: '2026-07-22'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/fluent-bit.png
tags:
- Logging
- Observability
- Metrics
- Open-Source
tags_raw:
- Logging
- Observability
- Metrics
- Open Source
url: https://raw.githubusercontent.com/api-evangelist/fluent-bit/refs/heads/main/apis.yml
created: '2026-03-25'
modified: '2026-05-19'
specificationVersion: '0.23'
apis:
- aid: fluent-bit:fluent-bit-build-api
  name: Fluent Bit Build API
  description: The Build API from Fluent Bit — 1 operation(s) for build.
  humanURL: https://docs.fluentbit.io/manual/administration/monitoring
  baseURL: http://127.0.0.1:2020
  tags:
  - Builds
  tags_raw:
  - Build
  properties:
  - type: OpenAPI
    url: openapi/fluent-bit-build-api-openapi.yml
  - type: Documentation
    url: https://docs.fluentbit.io/manual/administration/monitoring
- aid: fluent-bit:fluent-bit-health-api
  name: Fluent Bit Health API
  description: The Health API from Fluent Bit — 2 operation(s) for health.
  humanURL: https://docs.fluentbit.io/manual/administration/monitoring
  baseURL: http://127.0.0.1:2020
  tags:
  - Health
  properties:
  - type: OpenAPI
    url: openapi/fluent-bit-health-api-openapi.yml
  - type: Documentation
    url: https://docs.fluentbit.io/manual/administration/monitoring
- aid: fluent-bit:fluent-bit-metrics-api
  name: Fluent Bit Metrics API
  description: The Metrics API from Fluent Bit — 4 operation(s) for metrics.
  humanURL: https://docs.fluentbit.io/manual/administration/monitoring
  baseURL: http://127.0.0.1:2020
  tags:
  - Metrics
  properties:
  - type: OpenAPI
    url: openapi/fluent-bit-metrics-api-openapi.yml
  - type: Documentation
    url: https://docs.fluentbit.io/manual/administration/monitoring
- aid: fluent-bit:fluent-bit-reload-api
  name: Fluent Bit Reload API
  description: The Reload API from Fluent Bit — 1 operation(s) for reload.
  humanURL: https://docs.fluentbit.io/manual/administration/monitoring
  baseURL: http://127.0.0.1:2020
  tags:
  - Reload
  properties:
  - type: OpenAPI
    url: openapi/fluent-bit-reload-api-openapi.yml
  - type: Documentation
    url: https://docs.fluentbit.io/manual/administration/monitoring
- aid: fluent-bit:fluent-bit-storage-api
  name: Fluent Bit Storage API
  description: The Storage API from Fluent Bit — 1 operation(s) for storage.
  humanURL: https://docs.fluentbit.io/manual/administration/monitoring
  baseURL: http://127.0.0.1:2020
  tags:
  - Storage
  properties:
  - type: OpenAPI
    url: openapi/fluent-bit-storage-api-openapi.yml
  - type: Documentation
    url: https://docs.fluentbit.io/manual/administration/monitoring
- aid: fluent-bit:fluent-bit-uptime-api
  name: Fluent Bit Uptime API
  description: The Uptime API from Fluent Bit — 1 operation(s) for uptime.
  humanURL: https://docs.fluentbit.io/manual/administration/monitoring
  baseURL: http://127.0.0.1:2020
  tags:
  - Uptime
  properties:
  - type: OpenAPI
    url: openapi/fluent-bit-uptime-api-openapi.yml
  - type: Documentation
    url: https://docs.fluentbit.io/manual/administration/monitoring
common:
- type: IssueTracker
  url: https://github.com/fluent/fluent-bit/issues
- type: Releases
  url: https://github.com/fluent/fluent-bit/releases
- type: SecurityPolicy
  url: https://github.com/fluent/fluent-bit/blob/master/SECURITY.md
- type: CodeOfConduct
  url: https://github.com/fluent/fluent-bit/blob/master/CODE_OF_CONDUCT.md
- type: ContributionGuide
  url: https://github.com/fluent/fluent-bit/blob/master/CONTRIBUTING.md
- type: License
  name: Apache-2.0
  url: https://github.com/fluent/fluent-bit/blob/master/LICENSE
- type: AgenticAccess
  url: agentic-access/fluent-bit-agentic-access.yml
- type: DomainSecurity
  url: security/fluent-bit-domain-security.yml
- type: Website
  url: https://fluentbit.io
- type: Documentation
  url: https://docs.fluentbit.io
- type: GitHubRepository
  url: https://github.com/fluent/fluent-bit
- type: Slack
  url: https://launchpass.com/fluent-all
- type: Community
  url: https://fluentbit.io/community/
- type: Integrations
  url: https://fluentbit.io/integrations
- url: https://fluentbit.io/blog/index.xml
  type: Blog
integrations:
- name: Fluentbit, High Performance
- name: slack
- name: An End to End
- name: how it works
- name: G cloud
- name: microsoft
- name: aws
- name: digital ocean
- name: cisco
- name: new relic
- name: sumo logic
- name: logiq
- name: trend
- name: datadog
- name: logdna
- name: lyft
- name: couchbase
- name: humio
- name: linkedin
- name: vmware
- name: wallmart
- name: transit
- name: splunk
- name: gaintswarm
- name: WSO2
- name: qualtrics
- name: swyft
- name: dell
- name: swym
- name: gm
- name: Scalable}
- name: Flexible}
- name: Efficient}
- name: Extensible}
- name: Event-Driven Architecture
- name: Dynamic Routing
- name: Flexible Configuration
- name: Robust I/O Handler
- name: Upstream Manager
- name: Security & TLS
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com

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