A library with reusable code to detect failure at certain raid tasks. At last count there are 107 different "fails" that are tracked (updated for ToC/Icecrown courtesy of Maat/sztanpet/MysticalOS). Please note, this list is not always up-to-date.

The Icecrown Citadel list includes:

Fail_Rotface_OozeExplosion
Fail_Rotface_StickyOoze
Fail_Marrowgar_Whirlwind
Fail_Marrowgar_Coldflame
Fail_Marrowgar_SaberLash
Fail_Festergut_VileGas
Fail_Festergut_PungentBlight
Fail_Deathwhisper_DeathNDecay
Fail_Sindragosa_TailSmash
Fail_Sindragosa_FrostBreath
Fail_Sindragosa_BlisteringCold
Fail_Sindragosa_Cleave
Fail_Sindragosa_UnchainedMagic
Fail_Sindragosa_FrostBomb
Fail_Sindragosa_IceTomb
Fail_Professor_MutatedSlime
Fail_LanaThel_UncontrollableFrenzy
Fail_LanaThel_BloodboltSplash
Fail_BloodPrinces_SystemicShockVortex
Fail_LanaThel_DeliriousSlash
Fail_Gunship_Explosion
Fail_Gunship_Explosion_Knockback

The Onyxia's Lair list includes:

Fail_Onyxia_DeepBreath
Fail_Onyxia_FlameBreath
Fail_Onyxia_TailSweep
Fail_Onyxia_WarderCleave
Fail_Onyxia_WarderNova
Fail_Onyxia_Cleave

The Trial of The Crusader list includes:

Fail_Acidmaw_AcidicSpew
Fail_Acidmaw_ParalyticToxin
Fail_Acidmaw_SlimePool
Fail_Anubarak_Impale
Fail_Dreadscale_MoltenSpew
Fail_FactionChampions_Hellfire
Fail_Gorehowl_FireBomb
Fail_Icehowl_Trample
Fail_Jaraxxus_FelInferno
Fail_Jaraxxus_LegionFlame
Fail_Valkyr_Orb
Fail_Valkyr_Vortex
Fail_FactionChampions_Bladestorm

The Ulduar list includes:

Fail_Algalon_BigBang
Fail_Algalon_CosmicSmash
Fail_Auriaya_SonicScreech
Fail_Auriaya_Voidzone
Fail_Council_Overload
Fail_Council_RuneOfDeath
Fail_Deconstructor_Light
Fail_Deconstructor_Gravity
Fail_Deconstructor_Voidzone
Fail_Freya_NatureBomb
Fail_Freya_Sunbeam
Fail_Freya_UnstableEnergy
Fail_Hodir_BitingCold
Fail_Hodir_FlashFreeze
Fail_Hodir_Icicle
Fail_Kologarn_Eyebeam
Fail_Mimiron_BombBots
Fail_Mimiron_Flames
Fail_Mimiron_FrostBomb
Fail_Mimiron_LaserBarrage
Fail_Mimiron_NapalmShell
Fail_Mimiron_ProximityMine
Fail_Mimiron_Rocket
Fail_Mimiron_Shock
Fail_Mimiron_Siren
Fail_Mimiron_WaterSpray
Fail_Racorscale_Flame
Fail_Thorim_Blizzard
Fail_Thorim_LightningChain
Fail_Thorim_LightningCharge
Fail_Thorim_Smash
Fail_Vezax_Leech
Fail_Vezax_Saronite
Fail_Vezax_ShadowCrash
Fail_Yogg_DeathRay
Fail_Yogg_LunaticGaze
Fail_Yogg_OminousCloud
Fail_Yogg_Sanity

The Vault of Archavon list includes:

Fail_Koralon_MeteorFist
Fail_Archavon_ChokingCloud
Fail_Emalon_LightningNova
Fail_Emalon_ChainLightning
Fail_Koralon_FlameCinder

The Obsidian Sanctum list includes:

Sartherion's Lava Waves
Sartherion's Void Zones
Sartherion's Flame Breath
Sartherion's Tail Lash

The Eye of Eternity list includes:

Fail_Malygos_Dot
Fail_Malygos_ArcaneBreath

The Naxxramas list includes:

Heigan Dance
Kel'Thuzad's Void Zones
Sapphiron's Breath
Sapphiron's Cleave
Sapphiron's Tail Sweep
Frogger
Thaddius Left/Right
Thaddius Jump
Grobbulus - Dispelling Mutating Injection
Grobbulus - Standing in the poison cloud
Four Horseman - Mark
Four Horseman - Void Zone

Rewrite of FailBot logic to perform these detections.

This is an open repository. Feel free to add to it, and make fixes yourself.

API: http://www.wowace.com/projects/libfail-1-0/pages/api/lib-fail-1-0/

Sample Code

local fail = LibStub("LibFail-1.0")
local fail_events = fail:GetSupportedEvents()

local function onFail(event, who, failtype)
   -- Use the spellid as a default localized string for the fail event
   local spell = GetSpellInfo(fail:GetEventSpellId(event)) or ""

   -- Use the "failtype" argument to print appropriate messages based on it.
   local failmsg
   if failtype == fail.FAIL_TYPE_NOTMOVING then
       failmsg = "%s fails at moving (%s)"
   end

   print( failmsg:format(who, spell) )
end
for _, event in ipairs(fail_events) do
	fail.RegisterCallback("SampleAddon", event, onFail)
end