EDIT: Click here and check out what Hamlet wrote on the topic.
Made a list, thought I'd share. Please alert me if I missed something or got anything wrong.
DEBUFFS REQUIRING IMMEDIATE ATTENTION:
Gruul: Petrifying Slam 155323, Petrify 155330 shows stacks
Blast Furnace: Bomb 159558 and 155192, Volatile Fire 176121, Pyroclasm (Haven't found spell ID, interrupted in all logs I've looked at.)
Beastlord Darmac: Conflagration 154981
Flamebender Ka'graz: Blazing Radiance 155277 Fixate 154952 Molten Torrent 154932 (Lava Slash 155314 only up 1s, can help you move from the ground effect)
Hans'gar & Franzok: Shattered Vertebrae(M) 157139
Operator Thogar: Delayed Siege Bomb 159481 (not sure there's time to react)
The Iron Maidens: Fixate 158702, Dominator Blast 158601
Blackhand: Fixate 156653 Marked for Death 156096
Spell-IDs for Tellmewhen:
Code:155323; 159558; 155192; Pyroclasm; 154981; 176121; 157139; 159481; 158702; 158601; 156653; 156096
INTERRUPTS:
Oregorger:
Blackrock Barrage 156877 Dense waves of 3H/5M, needs assignments with backup.
Blast Furnace:
Furnace Engineer: Repair 155179, Electrocution 155201
Electrocution not listed as interruptable in DJ.
Foreman Feldspar:Pyroclasm 156937 every 20s
Always interrupted in all logs I've seen.
Slag Elemental: Burn 155200 Spammed
Fire Caller: Cauterize Wounds 155186 >10s between each. Lava Burst 159408 Spammed
Operator Thogar:
Grom'kar Firemender: Cauterizing Bolt 160140
The Iron Maidens:
Battle Medic Rogg: Ligtning Bolt 158709, Earthen Barrier 158708, Chain Lightning 158710
Iron Eviscerator: Expose Armor 158686 spammed
Blackhand:
Iron Soldier: Explosive Round 156728
FRIENDLY MAGIC DISPELLS:
Beastlord Darmac: Inferno Breath 154989 Conflagration 154981 Superheated Shrapnel 155499
Flamebender Ka'graz: Singe 154981
Iron Maidens, Enforcer Sorka: Convulsive Shadows 156214 should probably not be dispelled.
OFFENSIVE MAGIC DISPELLS:
Blast Furnace: Primal Elementalist: Reactive Earth Shield 155173
DISPELLABLE ENRAGE:
Beastlord Darmac: Beastlord Darmac(M) Pack Beast(H/M): Savage Howl 155208
IMPORTANT INTERRUPTS:
Blackrock Barrage 156877
Furnace Engineer: Repair 155179
Foreman Feldspar: Pyroclasm 156937
Fire Caller: Cauterize Wounds 155186
Grom'kar Firemender: Cauterizing Bolt 160140
Battle Medic Rogg: Earthen Barrier 158708
Iron Eviscerator: Expose Armor 158686
IMPORTANT FRIENDLY DISPELLS:
Conflagration 154981
Potentially usefull for DPS in a Raid 1-40-alert tellmewhen:
Rune of Grasping Earth 157059
Pinned Down 154960