If a have a system case id with OGS enabled, when WC1 deletes a profile of one the the matched items, will OGS Monitoring API return it as an update?
If the WC1 profile is deleted from the one of the matches in the result set of a case, no update notification is returned on the OGS monitor API.
What is the probability to have that developed in the future? If we are using OGS to not hit WC1 server when there is no update, we lose that kind of removal scenario. The only way to identify that is calling the profile API and getting a 404.
You are correct that the only way to find if a profile has been removed is to call the profile API and get a 404 for it.
I will write to product management and discuss with them if this can be an enhancement.