[arch-dev-public] News Draft: mirror status

[Dan McGee]

Mirror status and customized mirror lists

The website now provides a [mirror status page](/mirrors/status/) that
regularly polls all known mirrors and gathers statistics like delay,
check duration, and availability. Please consult the page for more
details on what is collected and how it works.

In addition, you can now [update your mirrorlist](/mirrorlist/) and
choose to have it automatically sorted using the up-to-date mirror
status information.