Mouseover the displayed icons to show a table showing how many buffs the classes in your raid have. Buff categories include world buffs, melee buffs, caster buffs, protection potions, and flasks. The table only updates on mouseover instead of realtime to improve performance. Additional buffs can be tracked by editing the "Raid Buff Counter config - X" auras in the Actions tab.
IMPORTANT: This weakaura is part of a collection and does nothing by itself. It requires 2 other weakauras to function which you can download here: https://wago.io/kPbLJPEm8