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When MagicDNS is enabled but no global upstream resolvers are configured, the forwarder only handles specific suffixes and defers other names to the system resolver. A query it has no resolver for is expected in that case, so don't raise the dns-forward-failing warning unless a default "." route makes Tailscale the default resolver. Fixes #19931 Signed-off-by: Brendan Creane <bcreane@gmail.com>