> For the complete documentation index, see [llms.txt](https://developer.harness.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://developer.harness.io/release-notes/waap-release-notes/2026/agent-release-notes/istio.md).

# Istio

## 2.4.0 - 16<sup>th</sup> September

### Updates

#### Request-only evaluation

The agent can now evaluate policies during the request phase alone and close the stream early, rather than processing the response as well. When response inspection is not required, latency decreases and throughput increases.

#### Dynamic metadata support for tracer properties

The agent can now configure tracer properties from dynamic metadata in your Istio Envoy filter definitions. Contextual attributes, environment information, and custom routing metadata are propagated into the telemetry stream without static configuration.