Features

Two cross-cutting feature catalogs make up most of what Traefik exposes to operators: the providers it can pull configuration from, and the middlewares it can attach to routers. They live as their own subdirectories so each can be browsed independently.

Feature catalog	Source	What it does
Providers	pkg/provider/*	Source configuration from Docker, Kubernetes, KV stores, files, REST API, ACME, Tailscale, and more.
Middlewares	pkg/middlewares/*	Transform, filter, authenticate, rate-limit, compress, retry, redirect, log, trace, and otherwise modify HTTP/TCP traffic.

These are the two extension points operators interact with directly. Routers, services, and TLS settings glue them together — see Routing and Service and load balancing.