This NIP is not yet in main. Here is an overview of PRs referencing this NIP.
Add Kind 15 for Encrypted File message OPEN @water783
format(all): JSON formatting MERGED @kehiy
nchat OPEN @v0l
NIP-17 Fix kind number  MERGED @bezysoftware
NIP-17: Add tag for file attachments CLOSED @Vap0r1ze
Adds key aliases to NIP-17 OPEN @vitorpamplona
nip17: relay considerations and implementation details MERGED @fiatjaf
NIP-17 Git Code Collaboration Rebooted CLOSED @DanConwayDev
nips over nostr CLOSED @Semisol
NIP-17 (old 24) Sealed Gift-Wrapped Messages for Private DMs and Small Group Chats MERGED @vitorpamplona
NIP-17 - Event Metadata OPEN @arthurfranca
NIP-17 Code Collaboration OPEN @DanConwayDev
NIP-17: Tracking Git Commits with Nostr OPEN @melvincarvalho
NIP-17 Git Updates and Discovery Over Nostr - first draft CLOSED @melvincarvalho