Hi,
I think retrace service is running on RHEL 7.7 server and since we have
zstd rpms in Fedora 31 [0], it won't work. I don't know what's the ETA for
fix, I can ask on Tuesday, if there is any update on this issue.
Until then, you'll probably have to generate stack traces locally :/
[0]
https://bugzilla.redhat.com/show_bug.cgi?id=1720729