What is the status of incremental xDS support?

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.