Assume a "public" API Gateway having a single domain name (ex. api.mybigcompany.com) and a set of 8 static IP addresses assigned to an "East" hosting facility to load balance that domain.
A subset of my API consumers need to whitelist these IPs in their firewall so that their calling application will only go to these IPs, and also I have committed to return only these IPs in DNS for that domain.
In the future, I may want to expand the pool either in the same facility, or at a "West" facility, etc.
Are there any "industry standard" SLAs for the change management notification lead time to my external API consumers when I need to change the IP pool?