Features

The "features" lens covers cross-cutting capabilities — extension families and pieces of functionality that span multiple systems. Each page here is one extension category or one capability that touches the whole proxy.

Pages

Page	Topic
xDS configuration	The dynamic-config plane: LDS, CDS, RDS, EDS, SDS, RTDS, ECDS, ADS, delta xDS.
HTTP filters	The L7 filter family in source/extensions/filters/http/ (71 filters).
Network filters	The L4 filter family in source/extensions/filters/network/ (28 filters).
Listener filters	Pre-filter-chain socket inspection.
Transport sockets	TLS, ALTS, raw, proxy_protocol, internal_upstream — pluggable wire framing.
Load balancing	Host selection: round_robin, least_request, ring_hash, maglev, subset, override_host.
Access logging	Per-request log emission via the file/grpc/fluentd/open_telemetry sinks.
Tracing	Span emission via Datadog / OpenTelemetry / Zipkin / SkyWalking / X-Ray / Fluentd.
Wasm	The WebAssembly runtime hosting plugins for filters, access loggers, and stat sinks.
Dynamic modules	The C ABI for dlopen-loaded Rust/Go/C extensions.
QUIC and HTTP/3	The QUIC stack and HTTP/3 codec.

What's not here

• The long-lived in-process subsystems (cluster manager, listener manager, HCM, router, stats, …) live in systems.
• The deployable binaries (envoy-static, contrib, mobile) live in apps.

Why "features"?

Most of these pages describe an extension category — a family of plugins that all implement the same interface and plug into the same piece of core. Categorising them gives the wiki a place to discuss the family as a whole (how to add one, what the lifecycle is, where to register a factory) without enumerating every individual plugin. For specific operator-facing details on a particular filter, the canonical reference is on envoyproxy.io.