In Discordmember

The raid post

The raid message in the channel, with the buttons for you to say whether you are going.

What it does: When a raid is scheduled, the bot posts in the channel when it is, where it is, how many are going and who is going, in columns by class. Below are the buttons Sign up, Late, Tentative, Absent and Leave. On each click the post redraws itself, in every channel where the raid was posted. The time shows on the reader's clock.
Who sees it: Everyone who sees the channel reads and clicks, with no role and no addon. In a raid with approval, whoever clicks Sign up or Late stays in Waiting on an officer until an officer approves on the site.
Where to find it: In the channel where the raid was scheduled, through /raid create or the site. The same raid can be in several channels and servers, and can get a thread for the night's chatter.

Sign up and Late ask which character you are going with, or the class and spec if you do not have a character yet. Tentative, Absent and Leave ask nothing.
Late holds your spot the same way as Sign up. In the post, your name gets a ⏱.
The limits are per role: tank, healer and DPS. Whoever goes over their own role's limit goes to the Waitlist, and the click's reply says so. When a spot opens, the first on the Waitlist gets in, in signup order.
Absent leaves your name on the post, under Absent. Leave removes your name and frees the spot for the next on the Waitlist.
The post shows the name, the spec icon and ⭐ for officers. Item level and attendance never appear in it: they stay on the raid page on the site.
A closed or cancelled raid says Closed or Cancelled at the top, and all buttons turn grey, including Absent and Leave. When the signup deadline passes, the raid closes by itself.
The post comes in the server's language. The reply only you see, after the click, comes in your Discord's language.

After the raid, the post does not change to show who came. The night's result (people, bosses, items) goes out in a separate message, only in the channel where the guild pinned the upcoming raids list, and each person's attendance stays on the site.
The roster says 18/25 and you still landed on the Waitlist: the remaining spot is for another role. Tank, healer and DPS are counted separately.
Whoever marked Tentative without ever choosing a character shows up with their Discord name and “(no character)”. A character is only asked of whoever takes a spot.
The post says how many signups have no addon, never who. In a raid with two or fewer confirmed, not even the number appears.