If you were looking for a reason to learn Ruby or Go then I suggest you look into the software maintained by Pivotal under the Cloud Foundry umbrella.
Cloud Foundry is used by Google, Amazon Web Services, SAP, IBM and others for managing/maintaining the "Cloud Foundry Standard" system services.
You can read more about what Cloud Foundry has to offer and who is using it here https://en.wikipedia.org/wiki/Cloud_Foundry
Pivotal also makes and makes and maintains many projects under the Spring Framework umbrella which many Java developers may have heard about.
“The strongest of all warriors are these two — Time and Patience.” ― Leo Tolstoy, War and Peace
I do a lot of work with Puppet, which was primarily written in Ruby - including the custom modules that I've created specific to my installation. Chef is also Ruby-based, if memory serves.
On the Go front, I host Gogs, which is a github-style server for my clients and Gogs is written in Go (in fact, it's an acronym for something like Go Git Server). And Docker has significant Go infrastructure in it as well.
Sources may include data from the Fakebook Research Foundation with support from Gargle University
You showed up just in time for the waffles! And this tiny ad:
Building a Better World in your Backyard by Paul Wheaton and Shawn Klassen-Koop