Resolution
This feature shipped in the Operations Center Server Plugin v1.7.2. The most recent version of this Plugin is 1.7.6. Please upgrade the Operations Center Server Plugin to version 1.7.6 (or most recent) which will allow you set environment variables as shown in the screen shot below:
This article is part of our Knowledge Base and is provided for guidance-based purposes only. The solutions or workarounds described here are not officially supported by CloudBees and may not be applicable in all environments. Use at your own discretion, and test changes in a safe environment before applying them to production systems.