public ConsulEndpointGroupBuilder datacenter(String datacenter) {
        this.datacenter = requireNonNull(datacenter, "datacenter");
        return this;
    }
Sets which <a href="https://www.consul.io/api-docs/catalog#dc-2">datacenter</a> to query.
If not set, the datacenter of the local agent is used by default.
consul/src/main/java/com/linecorp/armeria/client/consul/ConsulEndpointGroupBuilder.java