---
title: Agent - 3.1.0
slug: feature-experimentation/release-notes/agent-3-1-0
docTags: 
createdAt: 2026-07-20T15:44:42.147Z
---

## [\[3.1.0\] - November 3, 2023](docId\:Z3Jyom9fRqaiOqSawQJps)

- Added support for Prometheus-based metrics alongside expvar metrics. This can be configured from the config.yaml file. ([https://github.com/optimizely/agent/pull/348](https://github.com/optimizely/agent/pull/348))
- Added support for OpenTelemetry tracing. Distributed tracing is also supported according to [W3C TraceContext](https://www.w3.org/TR/trace-context/). ([https://github.com/optimizely/agent/pull/400](https://github.com/optimizely/agent/pull/400), [https://github.com/optimizely/agent/pull/401](https://github.com/optimizely/agent/pull/401), [https://github.com/optimizely/agent/pull/402](https://github.com/optimizely/agent/pull/402))

[https://github.com/optimizely/agent/releases/tag/v3.1.0](https://github.com/optimizely/agent/releases/tag/v3.1.0)