ForeverDB

The coach: a short fight report after boss and elite fights, if you want it.

• After a fight with a boss or an elite, a small book icon appears beside the rotation assistant. Nothing else: no sound, no popup, no chat line, and nothing during the fight. Click it for your fight report; right-click it to put it away, or just ignore it: it fades after a minute and a half and goes after 10 minutes. When several reports are waiting it shows how many. Drag it anywhere you like.
• The fight report: your active time, how long you kept up the debuffs and buffs that matter for your spec, the cooldowns you used out of those you could have, the procs you used in time, whether you went in without your food, flask, weapon oil, buffs, pet or stance, and your deaths. Then your #1 thing to fix, picked by how much it's worth for your spec, with why and where that comes from, and top players' numbers when there are enough logs (with how many). A full breakdown of any fight you log is on foreverdb.net/replay.
• What the coach knows about your spec comes from ForeverDB's study, made every week and after game updates: the WoW Forever client's data, ForeverDB's simulator and players' uploaded fights (never a name). It comes with ForeverDB's data updates, so it gets better without a new addon version. Until your spec has a profile, reports show your active time, casts a minute and deaths.
• New Coach page (the Rotation page, "Open Coach"; also Settings > Coach, Esc > Options > AddOns, and the report's "Coach page" button): your spec's priority, procs and moments to react to, what to keep up, when to use your cooldowns, what to have before the pull (checked right now), what to avoid, each with where it comes from (client data, simulator, players' logs with their count, or Speculation with its reason), when it was updated and for which game build, and your last reports.
• The last 20 reports are kept for each character, on your PC only. They're not uploaded, and they never hold another player's name.
• On by default, as just that icon. Settings > Coach: turn the reports off, report on every fight (not only bosses and elites), or leave out the pull check.
• Advanced, off by default: hints during the fight (one small line above the rotation icon, one at a time: a casting gap, a debuff or buff ending, a proc to use, a cooldown waiting, low mana; each can be switched off on its own) and boss cast cues for your role ("Thrash: Stand behind"). Silent unless you choose a sound.
• The coach uses the rotation assistant's own tracking of your casts, cooldowns, auras and power. The combat log is closed to addons in WoW Forever, so it doesn't use it. It never makes a protected call, and makes its frames out of combat.