Fluentd / Fluent Bit
Lightweight, widely used log collectors and forwarders that ship logs from hosts and containers to a central backend.
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Fluentd and Fluent Bit are CNCF-graduated log collectors from the same project family: Fluentd is the original, plugin-rich collector written in Ruby/C, while Fluent Bit is a much lighter, faster reimplementation in C aimed at resource-constrained environments like edge devices and per-node sidecars in Kubernetes.
Both act as the “shipping” layer in a logging pipeline — reading logs from files, containers, or system journals, optionally parsing and enriching them, and forwarding them to a backend like Elasticsearch, Loki, or a commercial platform. Fluent Bit in particular is a common default log forwarder in Kubernetes distributions.
Visit the official site to choose between Fluentd and Fluent Bit for your use case.