in app/prism/Recommendations.scala [114:121]
def isUbuntu(ami: AMI): Boolean = ami.ownerId == "099720109477"
def isAmazon(ami: AMI): Boolean = ami.ownerId == "137112412989"
def isMachineImages(ami: AMI): Boolean =
ami.tags.get("BuildName").exists(_.endsWith("-machine-images"))
def isAmigo(ami: AMI): Boolean = ami.tags.get("BuiltBy").contains("amigo")
def isUnknown(ami: AMI): Boolean = {
!(isUbuntu(ami) || isAmazon(ami) || isAmigo(ami) || isMachineImages(ami))
}