I have received the same alert from Facebook Development a number of times now. They say:
Your App, Discourse Log-in, currently has access to Graph API v2.10 which will reach the end of its 2-year lifetime on 05 November, 2019. To ensure a smooth transition, please migrate all calls to Graph API v2.11 or higher. Use the API Upgrade Tool to understand exactly how this change will impact your app.
Note: If you do not see any impacted calls in the API Upgrade Tool, your app/code may not be affected by this upgrade.
I use Facebook as one of my log-ins to Discourse and it required this app. When I click their link to their API Upgrade Tool to see whether their upgrades will affect my app, it says:
Your app has no changes for the methods you selected between v2.10 and v4.0
Can I leave this app untouched? Should I upgrade this app or my Discourse? Thank you.
P.S. I do not know whether I have posted this in the right category.