The android-builder instance in the mobile project could use some work:
-Its name is misleading. Nothing gets built there; it just fetches an APK from Jenkins and serves it on a (probably very low traffic) web page.
-It's oversized; it's a medium-sized instance, but should be small (or even moved to Toolforge) for the work it's doing.
-Its image is a bit outdated, and it suffers from T135033 (run Puppet manually to reproduce).
Ideally we should create a new small Cloud instance with an up-to-date base image, name it something more appropriate (android-alpha-server, maybe), configure it otherwise identically to android-builder, switch over the web proxy setup, and then decom android-builder.
Alternatively, we could consider moving the alpha build download page to Toolforge, or just put it on releases.wikimedia.org with our other releases.