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get_dhcp_ha (declared on DhcpServerMixin, optional) is what a DHCP server's own HA configuration says: on or off, this server's peer name, each peer's name, role as the server words it, and HA URL. ConfigSyncMixin.get_config_sync is where a host pushes its configuration and for which services, by the names get_services reports; sync items without a service name stay visible under `unmapped`. A driver mixes it in, no role promises it. Both raise when they could not read. What the facts mean for a pair -- hot standby, which side to write to -- is the caller's (NetOrk/netork#1125).