--message-expiry-duration is an option that you can pass when creating a new tier (in your selfhosted instance). It is equivalent to the cache-duration for users publishing in that tier.

For instance, if you are a ntfy Pro user, your messages are cached much longer than the normal 12h (see https://ntfy.sh/v1/tiers).

The naming is a little odd. I think cache-duration should probably be called something else.

Thank you for contributing to the magic of the old school internet.

My question: How does one get to write an RFC? Do you have to become part of a certain group, or just be known in certain circles, or do you just start writing and then submit it somewhere? If I had a great idea that I think should become an RFC, what is the process to make this a reality?