I have SSO setup with WordPress and have the SSO Avatar override setting set on discourse so that it uses the avatar URL from my WordPress site. However it does not seem to update if the person is using Gravatar and changes their Gravatar image.
If I look at the users profile SSO Info on Discourse I see the URL for the Gravatar icon and dropping that URL into my browser brings up the updated Gravatar.
I know Discourse caches these so that it does not have to make so many calls to Gravatar. How often does Discourse check for updates on this? Since I have the override with SSO set there is no way to refresh the Gravatar from the profile edit screen.