Elastic Agent vs Fluentd

Elastic Agent collects logs, metrics, traces, availability, security, and other host data through one agent. Fleet supplies a web interface for centrally adding and managing agents and integrations, and can distribute upgrades and policies across thousands of agents at runtime. Administrators can track agent status, configuration, overhead, processes, and versions. Elastic Agent and Fleet include dashboards, visualizations, and ingest pipelines for popular services and platforms, with more than 300 ready-to-use integrations listed across search, security, observability, and cloud providers. Packages are provided for Linux, Windows, and macOS architectures and include a separate otelcol binary for OpenTelemetry Collector components. Elastic describes use across infrastructure, applications, and mobile-device telemetry. Elastic Cloud offers a free 14-day trial with one hosted deployment and three Serverless projects. Trial hosted deployments are limited to one active deployment, 4 GB RAM per availability zone for Elasticsearch data nodes, and up to two availability zones. Elastic directs users to documentation and its community forum for assistance. Paid tiers listed are Standard at $99 a month, Gold at $114 a month, Platinum at $131 a month, and Enterprise at $184 a month.

Fluentd is a free, open-source data collector for creating a unified logging layer. It uses JSON to handle log collection, filtering, buffering, and output across sources and destinations. More than 500 community plugins connect it to data sources and outputs, including Elasticsearch and Kibana, Splunk, AWS S3, Kafka, BigQuery, Datadog, and OpenTelemetry. It supports memory and file buffering, failover, and high availability to help prevent data loss between nodes. The project reports that a vanilla instance uses 30–40 MB of memory and can process 13,000 events per second per core. Fluentd v1 runs on Linux, Mac OSX, and Windows; community distributions also include Docker images, a Kubernetes DaemonSet, and Ruby gems. It is self-hosted, and its components are available under the Apache 2 License. The project lists community help and commercial support from companies offering enterprise services. The homepage notes vulnerabilities patched in Fluentd v1.19.3 and advises updating fluent-package to v6.0.4.