Sounds good. If the 5_8 builder is no longer useful nor functional, we can resolve this issue by removing it. Please file a separate tracking issue for adding the 6_0 builder, and feel free to send a CL. Thank you.
@tuxillo Yes—please mention that you need a key in the issue for the new builder, and the host name to use (I expect it'll be something like host-dragonfly-amd64-6_0). We can send it to you by email. Is the email in your GitHub profile okay to use?