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In the absence of a better mechanism, writing unqualified hostnames to the hosts file may be required for MagicDNS to work on some Windows environments, such as domain-joined machines. It can also improve MagicDNS performance on non-domain joined devices when we are not the device's primary DNS resolver. At the same time, updating the hosts file can be slow and expensive, especially when it already contains many entries, as was previously reported in #14327. It may also have negative side effects, such as interfering with the system's DNS resolution policies. Additionally, to fix #18712, we had to extend hosts file usage to domain-joined machines when we are not the primary DNS resolver. For the reasons above, this change may introduce risk. To allow customers to disable hosts file updates remotely without disabling MagicDNS entirely, whether on domain-joined machines or not, this PR introduces the `disable-hosts-file-updates` node attribute. Updates #18712 Updates #14327 Signed-off-by: Nick Khyl <nickk@tailscale.com>