Relay implementations can expose this in their NIP-11 document
https://github.com/nostr-protocol/nips/blob/master/11.md#server-limitations
https://github.com/nostrability/nostrability/issues/41
nostr:npub1uac67zc9er54ln0kl6e4qp2y6ta3enfcg7ywnayshvlw9r5w6ehsqq99rx do relays advertise in some way current follow list max count limit? Do relays notify users, outside of the above error nostr:npub1ktt8phjnkfmfrsxrgqpztdjuxk3x6psf80xyray0l3c7pyrln49qhkyhz0 experienced on nostrudel?
cc nostr:npub180cvv07tjdrrgpa0j7j7tmnyl2yr6yr7l8j4s3evf6u64th6gkwsyjh6w6
Discussion
You can find this document by sending a HTTP request to the relay url with the "Accept" header set to "application/nostr+json". My relay uses strfry which doesn't expose that information unfortunately. You can test it by sending this curl request:
curl 'https://nostr.oxtr.dev' --header 'Accept: application/nostr+json'
🙏
Added to nostrability repo