We’re accelerating domain requests for My Domains. With this update, you keep the same My Domain
address, but requests go through Salesforce Edge. Salesforce Edge uses machine-learning technology to
improve connectivity and performance. You can acknowledge this update to let Salesforce move your
org’s My Domain to the new service before the July 2020 auto-activation date.
https://help.salesforce.com/s/articleView?id=release-notes.rn_security_route_edge_my_domain_cruc.htm&release=224&type=5