I haven't seen zLinux on any publicly communicated roadmap yet, but that does not mean it's not in the works. You should contact your sales representative or Dynatrace technical manager for Oneagent (@Bartosz G.) to get the most accurate answer.
Hi @Barry L.,
I just want to give you an update on your question.
OneAgent for zLinunx or Linux on the IBM Z platform for Red Hat (RHEL 6.9+) will be available to all customers as an early adopter release soon (mid-August 2019 for managed) with agent version 1.173 and 1.174.
OneAgent for zLinux comes equipped with deep-monitoring modules for Java, Apache/IHS, and IIB/MQ.
We are also working on SUSE, which should follow shortly after Red Hat.
Hope that helps!