With the recently shipped APAR OA66898 PTF UJ96474 IBM OMEGAMON e3270UI there is a new function that allows end users to see if there are any connection issues when pulling data from agents and building a display. In order to turn on this function you must first update your preferences under SQL1. Select "Y" for Engage FFDC for SQL1 Analysis. Save it to your profile.
Then when you run a workspace in the e3270UI that may not get all agent information back you can dive deeper: On this zOS Overview click on the white Rows button to dive deeper: