This is useful for provisioning initially empty secondary A/B root file systems. We don't want those to ever be considered for automatic mounting, for example in "systemd-nspawn --image=", hence we should create them with the No-Auto flag turned on. Once a file system image is dropped into the partition the flag may be turned off by the updater tool, so that it is considered from then on. Thew new option for this is called NoAuto. I dislike negated options like this, but this is taken from the naming in the spec, which in turn inherited the name from the same flag for Microsoft Data Partitions. To minimize confusion, let's stick to the name hence.
System and Service Manager
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