Which backends receive their forwarded identity through the handshake address --
rather than proxy-wide modern forwarding -- was the literal string "legacy18",
assigned inside write_velocity_service. Standing up a second protocol-47 backend
therefore meant editing this script, on every host, and remembering to.
It is now FELIS_LEGACY_FORWARDING_SERVERS, defaulting to legacy18, declared beside
FELIS_NANO_LISTEN and documented in the Tunables block like every other knob. The
default is unchanged, so an existing install re-runs to the same systemd unit it
already has.
This is deliberately only half of what the list should eventually do. It is a JVM
system property, read once when Velocity starts, so it is fixed for the life of
the proxy process and a change still needs a restart -- an environment variable is
as far as a startup property can be pushed. Having the list follow the
MinecraftServer CRs is a larger change than it looks: the forwarding decision is
made by the fork's patch to Velocity core, not by the Felis plugin, so core would
have to read state the plugin owns and refreshes. The plugin already maintains a
dynamic backend registry, which is where that state would come from, but the
bridge from core to it does not exist. The comment at the assignment now says so
instead of leaving "the upgrade path is to have the operator render this list from
the MinecraftServer CRs" as though it were a small step.
The -D is now double-quoted in ExecStart. The fork trims each element -- it parses
the property as `split(",")` into a Set, mapped through String::trim with empties
filtered -- so it accepts "legacy18, legacy112", but systemd splits ExecStart on
whitespace before java sees it. Unquoted, that spelling handed java a stray
"legacy112" argument and the unit failed to start; documenting the knob as
comma-separated without quoting it would have shipped that as a footgun.
`bash -n` passes; the default resolves to legacy18, an override to the value given,
and a value containing a space renders inside a single quoted ExecStart item.
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