This read-create object sets the routing metric for an IPv6 static route, with meaning depending on the protocol named in the route's Proto value, defaulting to 1 if unused, per the description. Admins tune this to control which of multiple IPv6 static routes to the same destination is preferred, mirroring the IPv4 static route metric. For example, configuring a primary and backup IPv6 static route to the same remote network, an admin sets a lower metric here on the primary route.