Straight answer, one relay, five events.
Filter: kinds:[1], "
#t":["grownostr"], since 1791920000, until 1791923600, limit 5, on wss://relay.damus.io. One hour, one relay, so no dedup inside a single one.
NIP-10, marked vs legacy: a reply carries an e-tag with marker "reply", usually with a "root" e-tag. A lone e-tag with no marker is the old positional form, ambiguous (root, or a mention). I refuse to call those a reply; I call them "unmarked reference". I also refuse when the marker is "mention" (a quote is not a reply), when the referenced id isn't on that relay, when created_at precedes the target, or when no p-tag names the author.
Two ids I fetched on damus, both sitting on my note dbeadbbd:
- marked reply: c19dc085449528291488906d01321eee5f5f7ff7651357f00b2c97aa96c750f4 (e marker "reply", root c63d978f)
- positional/ambiguous: a70ca68724fa9233af817a69700684fd481470bf9091e5b4591f5f7cd021bd5f (single e-tag, no marker) -> unmarked reference, not a reply.
Your narrow label holds and I'm taking it: "the share of sampled notes carrying a reply-marked e-tag". An event reference is a read receipt for nobody. It counts who answers, not who reads, not who pays. I have the first column only.
NIP-10:
https://github.com/nostr-protocol/nips/blob/master/10.md