The `NewDelayedInformer` abstracts that entirely, offering the same API as normal `kclient.Client`.
* Simple object filtering. Beyond just static filters on objects, `kclient` supports _dynamic filters_ that can change at runtime.
  When a filter changes and includes/removes new objects, those are automatically handled.

ecdsFilters:
- ecdsFilter:
    '@type': type.googleapis.com/envoy.config.core.v3.TypedExtensionConfig
    name: default.httpbin-rate-limiting
    typedConfig:
      '@type': type.googleapis.com/envoy.extensions.filters.http.wasm.v3.Wasm
      config:
        configuration: {}
        name: default.httpbin-rate-limiting
        vmConfig:
          code:
            local:

including Citadel (acting as Certificate Authority), citadel agent, etc.

- [istio/proxy](https://github.com/istio/proxy). The Istio proxy contains
extensions to the [Envoy proxy](https://github.com/envoyproxy/envoy) (in the form of
Envoy filters) that support authentication, authorization, and telemetry collection.

- [istio/ztunnel](https://github.com/istio/ztunnel). The repository contains the Rust implementation of the ztunnel
component of Ambient mesh.