Fluentd website screenshot

Fluentd

Open source data collector for unified logging layer that allows you to unify data collection and consumption for better use and understanding of data.

Fluentd publishes 2 APIs on the APIs.io network: Forward Protocol and Events API. Tagged areas include Data Collection, Logging, and Open Source.

The Fluentd catalog on APIs.io includes 1 event-driven AsyncAPI specification, 1 JSON-LD context, and 2 Spectral governance rulesets.

Fluentd’s developer surface includes documentation, getting-started guide, engineering blog, changelog, support, and 10 more developer resources.

🌐 Visit website 📡 Source on GitHub
47.1/100 developing ▬ flat Agent 33/100 agent aware Full breakdown ↓
scored 2026-07-28 · rubric v0.6
AccessFreemium
3 APIs
Data CollectionLoggingOpen Source

Kin Score

Kin Score Kin Score How this is scored →
scored 2026-07-28 · rubric v0.6
Composite quality — 47.1/100 · developing
Contract Quality 16.3 / 25
Developer Ergonomics 5.2 / 20
Commercial Clarity 7.9 / 20
Operational Transparency 6.8 / 13
Governance 6.3 / 12
Discoverability 4.6 / 10
Agent readiness — 33/100 · agent aware
Machine-Readable Contract 18 / 18
Agentic Access Contract 10 / 10
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 6 / 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
Improve this rating by publishing the missing artifacts — every area above can be raised, and the full rubric is at apis.io/rating/. This rating is computed from github.com/api-evangelist/fluentd: open an issue to ask a question, or submit a pull request to add artifacts. Want it done for you? Prioritized profiling — $2,500 →

APIs 3

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

Fluentd Plugin API

The Fluentd Plugin API allows developers to write custom input, output, filter, parser, formatter, and buffer plugins in Ruby. Plugins are distributed as RubyGems and integrate ...

Fluentd Forward Protocol

The Fluentd Forward Protocol is a binary protocol used to transport event streams between Fluentd nodes and compatible agents over TCP. It supports multiple transport modes incl...

Fluentd Events API

Operations for posting log events and records to Fluentd via HTTP.

Open Collections 1

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

Fluentd HTTP Input API

OPEN COLLECTION

Pricing Plans 1

Published pricing tiers and plan structures.

Fluentd Plans Pricing

3 plans

PLANS

Rate Limits 1

Documented rate limits and quota policies.

Fluentd Rate Limits

5 limits

RATE LIMITS

FinOps 1

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

Fluentd Finops

FINOPS

Event Specifications 1

AsyncAPI definitions for this provider's event-driven and streaming APIs.

Fluentd Forward Protocol

The Fluentd Forward Protocol is a binary MessagePack-based protocol used to transport event streams between Fluentd nodes, Fluent Bit agents, and compatible forwarders over TCP ...

ASYNCAPI

Semantic Vocabularies 1

JSON-LD contexts and semantic vocabularies used across these APIs.

Fluentd Context

0 classes · 7 properties

JSON-LD

Spectral Rules 2

Spectral governance rulesets for linting and validating these APIs.

Fluentd API Rules

5 rules · 5 warnings

SPECTRAL

Fluentd API Rules

6 rules · 4 warnings 2 info

SPECTRAL

JSON Schema 1

Standalone JSON Schema definitions for this provider's data models.

Fluentd Log Event

3 properties

JSON SCHEMA

Security Posture 1

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

Fluentd Domain Security

TLSv1.3 · HSTS

SECURITY

Agentic Access 1

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

Fluentd Agentic Access

2 operations · 2 acting

2 operations · 2 acting

AGENTIC

Resources

Get Started 1

Portal, sign-up, and the first successful call

GettingStarted
GettingStarted

Documentation 2

Reference material describing how the API behaves

JSONSchema
JSONSchema
 Documentation
Documentation

Agent Surfaces 2

MCP servers, agent skills, and machine-readable catalogs

AgenticAccess
AgenticAccess
 LlmsText
LlmsText

Design & Contract 1

Pagination, idempotency, versioning, errors, and events

JSONLD
JSONLD

Build 2

SDKs, sample code, and the tooling you integrate with

GitHubOrganization
GitHubOrganization
 GitHubRepository
GitHubRepository

Access & Security 1

Authentication, authorization, and security posture

DomainSecurity
DomainSecurity

Operate 4

Status, limits, changes, and where to get help

ChangeLog
ChangeLog
 Community
Community
 Support
Support
 Slack
Slack

Company 2

The organization behind the API

Website
Website
 Blog
Blog

Source (apis.yml)

apis.yml Raw ↑ 
aid: fluentd
name: Fluentd
description: Open source data collector for unified logging layer that allows you to unify data collection and consumption
  for better use and understanding of data.
type: Index
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/fluentd.png
url: https://raw.githubusercontent.com/api-evangelist/fluentd/refs/heads/main/apis.yml
created: '2025-01-01'
modified: '2026-05-19'
specificationVersion: '0.19'
tags:
- Data Collection
- Logging
- Open Source
apis:
- aid: fluentd:fluentd-plugin-api
  name: Fluentd Plugin API
  description: The Fluentd Plugin API allows developers to write custom input, output, filter, parser, formatter, and buffer
    plugins in Ruby. Plugins are distributed as RubyGems and integrate with Fluentd's plugin management system to extend data
    collection and processing pipelines.
  humanURL: https://docs.fluentd.org/plugin-development
  tags:
  - Open Source
  - Plugin Development
  - Ruby
  properties:
  - type: Documentation
    url: https://docs.fluentd.org/plugin-development
  - type: Reference
    url: https://docs.fluentd.org/plugin-development/api-plugin-base
- aid: fluentd:fluentd-forward-protocol
  name: Fluentd Forward Protocol
  description: The Fluentd Forward Protocol is a binary protocol used to transport event streams between Fluentd nodes and
    compatible agents over TCP. It supports multiple transport modes including Message, Forward, PackedForward, and CompressedPackedForward,
    and includes authentication and heartbeat mechanisms.
  humanURL: https://github.com/fluent/fluentd/wiki/Forward-Protocol-Specification-v1
  tags:
  - Logging
  - Networking
  - Protocol
  properties:
  - type: Documentation
    url: https://github.com/fluent/fluentd/wiki/Forward-Protocol-Specification-v1
  - type: Reference
    url: https://docs.fluentd.org/input/forward
  - type: AsyncAPI
    url: asyncapi/fluentd-forward-protocol-asyncapi.yml
- aid: fluentd:fluentd-events-api
  name: Fluentd Events API
  description: Operations for posting log events and records to Fluentd via HTTP.
  humanURL: https://docs.fluentd.org/plugin-development
  tags:
  - Events
  properties:
  - type: OpenAPI
    url: openapi/fluentd-events-api-openapi.yml
  - type: Documentation
    url: https://docs.fluentd.org/input/http
common:
- type: AgenticAccess
  url: agentic-access/fluentd-agentic-access.yml
- type: DomainSecurity
  url: security/fluentd-domain-security.yml
- type: JSONSchema
  url: json-schema/fluentd-log-event-schema.json
- type: JSONLD
  url: json-ld/fluentd-context.jsonld
- type: Website
  url: https://www.fluentd.org/
- type: Documentation
  url: https://docs.fluentd.org/
- type: GettingStarted
  url: https://docs.fluentd.org/quickstart
- type: GitHubOrganization
  url: https://github.com/fluent
- type: GitHubRepository
  url: https://github.com/fluent/fluentd
- type: Blog
  url: https://www.fluentd.org/blog/
- type: ChangeLog
  url: https://github.com/fluent/fluentd/blob/master/CHANGELOG.md
- type: Community
  url: https://www.fluentd.org/community/
- type: Support
  url: https://docs.fluentd.org/quickstart/support
- type: Slack
  url: https://slack.fluentd.org/
- type: LlmsText
  url: https://docs.fluentd.org/llms.txt
maintainers:
- FN: Kin Lane
  email: kin@apievangelist.com