This "UCSC Xena and Cancer Genomics Browser" Google Group has been a fantastic resource thus far. Kudos to the Xena team for their fantastic support.
I do feel that while the support is exceptional, we're running into several limitations based on the current interface. Specifically, posts disappear for several hours/days until they appear online -- the first time I posted, I thought Google Groups ate my message. Also the formatting options are limited/undocumented. Search and lookup features are also limited. Overall the user interface is outdated.
Has the team considered moving this mailing list to GitHub issues? Users can still receive email updates (and even treat it like a mailing list). However, you will benefit from the superior GitHub community and issues interface. The ability to write markdown will be great for readability (embedded links, tables, headings, code blocks, etc). Finally, GitHub Issues has a nice API, which isn't an immediate concern but could be useful down the road in unexpected ways. I also expect GitHub issues will bring greater visibility and eventually search engine rankings to the content and support that the Xena team has worked hard to provide.
I couldn't find much on automatically migrating existing Google Group content to GitHub Issues. Based on what I found (
https://github.com/recursecenter/community/issues/268), it may be difficult. Therefore, the easiest solution may be to direct new discussion to GitHub Issues and hyperlink to legacy Google Group posts when needed.