The fragments are no longer dropping in Shards Landing. I had a whole group of 115s clearing out the underground city and non dropped. Typically 1 to 2 drop every 1 to 2 hour clearing the arena and silent hall. This is on Tunare.
How many mobs did you kill? For a 1% drop rate item you'd need to kill quite a few to conclusively determine it isn't dropping. 100 mobs is about 63% chance of getting at least one fragment 200 mobs is about 87% chance of getting at least one fragment 500 mobs is about 99.3% chance of getting at least one fragment So even if you slaughtered 500, there's still almost a 1% chance of getting no fragments.
Rain of Fear zones have a 2% chance to drop fragments. Best place is Heart of Fear: The Epicenter. See older posts on this topic.
I see a few Fragment of Legendary Alaran History looted on Tunare in Shard's Landing in the past few days. I think you are just having some bad luck.