They describe a leaderboard built from server members' shared gaming activity, while actual rollout remains unconfirmed.
When It Appears
“+{count}” can appear on a server view that ranks shared gaming activity and shows a timed competition when Discord displays a compact count for additional games or entries omitted from the visible list.
What It Means
When “+{count}” is shown, the current step is presenting a compact count for additional games or entries omitted from the visible list.
A user who saw “+{count}” in Discord is likely searching to confirm that it means a compact count for additional games or entries omitted from the visible list, where it appears, and which state it describes.