Directory Observability & MonitoringLog Management & AnalyticsFluentd

Fluentd

Open Source

About Fluentd

Fluentd is an open source data collector for a unified logging layer. It unifies data collection and consumption for use and understanding of data. It decouples data sources from backend systems by sitting between them as a logging layer. It uses plugins to connect to many data sources and outputs while keeping its core simple. Its components are available under the Apache 2 License.

Used for

Collecting logs from servers

Who it is for

Used by data-driven companies.

From Fluentd's own website, read 2026-10-23. How we build listings.

How to evaluate Log Management & Analytics

This is how the CIOPages Research Team evaluates this category. It is not an assessment of Fluentd. It comes from our Log Management & Analysis buyer guide.

25%

Cost & Tiering Model at Volume

Unit of pricing (per-GB ingest, compute/SVC, credits, host, consumption) and how the bill behaves as volume grows; hot/warm/cold/frozen or archive tiers, index-free or low-cost retention tiers, rehydration cost and latency, and ingest controls or sampling to cap spend

20%

Search, Query & Analytics Power

Full-text vs. label-only vs. schema-on-read; query language depth (SPL, ES|QL/KQL, LogQL, DQL, SQL) and learning curve; performance on cold and high-cardinality data; aggregations, pattern detection, and live-tail for real-time troubleshooting

20%

Pipeline, Ingestion & OpenTelemetry

Agent footprint and collector strategy; native OpenTelemetry/OTLP ingest; parsing, enrichment, masking, routing, and reduction before storage; ability to fan data out to multiple destinations and to swap backends without re-instrumenting sources

15%

Security, Compliance & Retention

RBAC/SSO, field-level masking of sensitive data, immutable/WORM audit retention, and tamper-evident logging; SOC 2 / ISO 27001 / FedRAMP coverage and data residency; SIEM or threat-detection content if logs feed security

10%

Observability Correlation & Architecture

Whether logs sit standalone, inside an observability suite (correlated with metrics and traces), or inside the SIEM; trace-to-log pivots, unified context, and how cleanly it slots beside tooling you already run

10%

Operations, Scale & AI Assist

Self-managed vs. SaaS operational burden, multi-tenant and multi-cluster scale, ingest spikes and back-pressure handling; API/IaC coverage; and AI-assisted features such as anomaly detection, log clustering/patterns, and natural-language query

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