Notice of Websocket API internal upgrade

As part of the ongoing capacity improvements to the platform, there will be a scheduled update to the Websocket API infrastructure at 16:00 UTC on 16th January.

There is no planned downtime to the trading engine for this change however please note that a momentary interruption in the deltas published on the websocket feed is expected at 16:00 UTC. Shortly after this all websocket connections will be forcibly disconnected to ensure no websocket client is left with an inconsistent view of their own orders, positions or the public order book upon reconnection. This change should otherwise be transparent to users.