There has been a lot of reports lately on instability issues on https://ci.jenkins.io/.
We need to do a systematic investigation on the configuration of the instance, what exact issues it is facing, etc.

Acceptance criteria

• Infra should be able to build Core and plugins without failing randomly all the time
• [[Do we want to define any more specific SLAs??]]

Some resources

• https://groups.google.com/forum/?utm_medium=email&utm_source=footer#!msg/jenkinsci-dev/xqC8vW_emJI/wd4celzWAwAJ
• https://groups.google.com/d/msg/jenkinsci-dev/BkAET7O-Wvc/aS6Le3rfAwAJ
• https://groups.google.com/d/msg/jenkinsci-dev/rKJ-xh2fiqo/3Y0c4mmjBAAJ