- Removed the `replies` array from threaded messages, replacing it with lightweight metadata fields.
- Added `reply_users`, `reply_users_count`, and `latest_reply` to expose reply participants and the most recent reply.
- Change takes effect March 31 2020; client integrations must update to handle the new structure.
Community impact
Community ratings: 0 Useful, 0 Noise, 0 Risky, 0 Broke, 0 Try.