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 API contracts indexed on the APIs.io network, including Build API, Health API, Metrics API, and 3 more. Tagged areas include Logging, Observability, Metrics, and Open Source.

The Fluent Bit catalog on APIs.io includes 1 Spectral governance ruleset.

Fluent Bit’s developer surface includes documentation, engineering blog, and 15 more developer resources.

🌐 Visit website 📡 Profile data on GitHub

31.7/100 thin ▬ flat Agent 20/100 agent aware Front door AI 1/6 silent Heartbeat 99/100 alive self hosted · Apache-2.0 Full breakdown ↓
scored 2026-11-06 · rubric v0.27.0 · Show this score on your site →

AccessFreemium

1 published contract

Logging Observability Metrics Open Source

Kin Score

Kin Score How this is scored →
scored 2026-11-06 · rubric v0.27.0

Composite quality — 31.7/100 · thin

Contract Quality 6.2 / 16

Developer Ergonomics 1.9 / 13

Access Clarity 1.0 / 13

Operational Transparency 3.3 / 8

Contract Governance 1.1 / 8

Discoverability 3.7 / 7

Regulatory Posture 0.9 / 15

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

Pagination 5 / 5

Distinct Operations 3 / 3

MCP Tool Quality 6 / 6

Regulatory Posture applies to this provider. Its tags matched the Horizontal (data, software, accessibility, platform) regime, so Regulatory Posture carries 15 points of the composite. If this regime is wrong for your business, say so on your provider repo — the applicability map is public and we will correct it.

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 65 points between them, because both conditional facets apply and carry 35 points together. That is why each facet's contribution is shown against a damped maximum: raising a quality facet moves the composite by 65% of its nominal weight, not 100%. The full arithmetic is at apis.io/rating/.

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Agent readiness — checks not met, largest first (exact, from this profile):

MCP Server +12 pts — deployment.mode + probe verdict on the mcp/ manifest, not the pointer; an unprobed slug falls back to authorship
Machine-Readable Auth +10 pts — a served openid-configuration/oauth-authorization-server carrying `issuer` (served), else the securitySchemes class in the provider OpenAPIs — bound (mutualTLS, DPoP, Signature) > negotiable (oauth2 authorizationCode/clientCredentials, openIdConnect) > bearer (http bearer, apiKey)
Idempotency +9 pts — OpenAPI mutating operations declare an idempotency key — a header, a request-body property, or a named de-duplication token whose own description says so (verified); else common[].type matches /idempoten/i (documented)
Stable Error Semantics +8 pts — OpenAPI $refs a shared error schema across 4xx/5xx responses (verified), else common[].type includes ErrorCatalog / ErrorCodes / DeclineCodes
A2A Agent Card +8 pts — a2a/-a2a.yml manifest, graded on conformance.grade against A2A 1.0.0
Registration Without a Human +6 pts — a `registration_endpoint` in the served RFC 8414 / OIDC discovery document

9 more unmet checks in the Agent Readiness table above.

Kin Score — facets with the most composite points still available (weight × headroom):

Access Clarity scores 7.9 — up to +18.4 composite points
Developer Ergonomics scores 14.3 — up to +17.1 composite points
Contract Quality scores 38.2 — up to +15.5 composite points

Each check links to what satisfies it. Publish the artifact, or tell us where it already lives, and the score moves on the next scoring run.

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 the provider profile at artifacts.apis.io/fluent-bit/apis.yml: open an issue on github.com/api-evangelist/fluent-bit to ask a question or point us at an artifact you publish. Submit an artifact on GitHub — free → Manage your own listing — the Influence plan, $499/mo →

Markets this provider is in provisional

The Kin Score Market layer reads a provider inside its market: its position, and how deep its integrations go. Depth is only comparable within a position. Provisional and unweighted: not part of the Kin Score or agent readiness.

Market	Position	Depth	Registered MCP server	Declares compatibility
Artifact Hub Cloud-Native Packages	standard	35.1 (thin)	-	-

Registered MCP server and declares compatibility are report only — not weighted. Undeclared means we found nothing we can read, so there is no number: we never infer integrations.

Standards implemented 1

Standards this provider implements or carries. De facto ones are profiled and measured by the API Commons; formal ones come from the standards directory and are linked by the provider's own tags. The evidence column says how each claim was established — not that it was made.

OpenAPI

measured — observed by APIs.io (published)

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 7

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

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 7

Fluent Bit API pricing

Not yet checked against Fluent Bit's own pricing page. Compiled by API Evangelist on 2026-05-04; confirm before you rely on a figure. A free plan or tier is listed.

Plan	Price
Free freemium	Free
Professional paid	Free
Enterprise enterprise	—

Plan details, limits and sources →

Rate limits

Free Tier Default: 10 requests per minute
Free Tier Monthly Quota: 1000 requests per month
Professional Tier Default: 100 requests per minute

Compiled by API Evangelist, not yet checked against Fluent Bit's documentation. All 5 limits →

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

Service Levels 1

Uptime the provider promises or reports, as SLA4OAI. Read from its own pages; APIs.io runs no monitors.

Fluent Bit

SLA

FinOps 1

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

Fluent Bit Finops

FINOPS

Spectral Rules 1

Spectral governance rulesets for linting and validating these APIs.

Fluent Bit API Rules

34 rules · 32 errors 1 warnings 1 info

SPECTRAL

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 5

Status, limits, changes, and where to get help

RateLimits

IssueTracker

Releases

Slack

Community

Commercial 3

Pricing, plans, and the legal terms of use

Plans

Plans

FinOps

FinOps

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: low
  try_now_blocked_by: loopback
  source:
  - plans
  - security
  generated: '2026-11-06'
  method: derived
image: https://kinlane-images.s3.amazonaws.com/shared/apis-json/icons/fluent-bit.png
x-docs-platform: gitbook
x-docs-platform-confidence: medium
x-docs-platform-checked: 2026-10-03
tags:
- Logging
- Observability
- Metrics
- Open Source
tags_raw:
- Logging
- Observability
- Metrics
- Open Source
- 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: Plans
  url: plans/fluent-bit-plans-pricing.yml
- type: RateLimits
  url: rate-limits/fluent-bit-rate-limits.yml
- type: FinOps
  url: finops/fluent-bit-finops.yml
- 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

Fluent Bit API — frequently asked questions

Does Fluent Bit have an API?

Yes. APIs.io lists 6 APIs from Fluent Bit, including Fluent Bit Build API, Fluent Bit Health API and Fluent Bit Metrics API, and 3 more.

Is there an OpenAPI specification for the Fluent Bit API?

Yes. APIs.io indexes 6 OpenAPI specifications for Fluent Bit, each linked for download from this page.

How much does the Fluent Bit API cost?

APIs.io lists 3 pricing plans for Fluent Bit, with each plan's price, limits and inclusions under Pricing on this page.

Is the Fluent Bit API ready for AI agents?

Fluent Bit has a Kin Score of 31.7 out of 100 (thin) and an Agent Readiness score of 19.6 (agent-aware), scored by API Evangelist on 2026-11-06.

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get_provider_toolsEvery MCP tool they ship, with the operation each wraps.
get_provider_evidenceHow each part of their score was established. Free — the basis for a claim should not sit behind it.
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apis_io_searchSTART HERE — APIs, providers and tags for one query, each with its total.
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Every operation they expose

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