# Grafana v4.0.1 — Release & Upgrade Intelligence
- **Product:** Grafana (https://grafana.com)
- **Version:** v4.0.1
- **Released:** Dec 03, 2016
- **Impact Score:** 5/10
- **Breaking Changes:** Not verified
- **Canonical Analysis:** https://changelogs.us/grafana/updates/v4.0.1/

## Executive Summary (TL;DR)
Grafana v4.0.1. Source highlight: 4.0.0 had serious connection pooling issue when using a data source in proxy access. This bug caused lots of resource issues

## Bug Fixes
- **Metrics**: Fixes nil pointer dereference on my arm build #6749
- **Data proxy**: Fixes a tcp pooling issue in the datasource reverse proxy #6759