What is the status of incremental xDS support?
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The :ref:`incremental xDS <xds_protocol_delta>` protocol is designed to improve efficiency,
scalability and functional use of xDS updates via two mechanisms:

* Delta xDS. Resource deltas are delivered rather than state-of-the-world.
* On-demand xDS. Resource can be lazy loaded depending on request contents.

Currently, all xDS protocols (including ADS) support delta xDS. On-demand xDS is supported for
:ref:`VHDS <config_http_conn_man_vhds>` only.