code: func NewTunnelConnection(name string, spec TunnelConnectionSpecV2) (TunnelConnection, error) {
  	conn := &TunnelConnectionV2{
  		Kind:    KindTunnelConnection,
  		SubKind: spec.ClusterName,
  		Version: V2,
  		Metadata: Metadata{
  			Name:      name,
  			Namespace: defaults.Namespace,
  		},
  		Spec: spec,
  	}
  	if err := conn.CheckAndSetDefaults(); err != nil {
  		return nil, trace.Wrap(err)
  	}
  	return conn, nil
  }
docs: // NewTunnelConnection returns new connection from V2 spec