What does Collecting Memories reward?

Collecting Memories gives a choice of Tunneler's Boots, Dusty Mining Gloves, Worn Miner's Waistcord, 1,350 experience.

Where does Collecting Memories start?

Wilder Thistlenettle in Stormwind City offers it.

Its level has not been recorded yet; it shows once a player accepts it with the addon running.

No. The quest exists in Classic Era as well.

World of Warcraft: Forever · quest

A quest in World of Warcraft: Forever, offered by Wilder Thistlenettle in Stormwind City. Recorded by 4 players running the addon.

Level and objectives show once a player with the addon accepts the quest.

Item	Given	Item level	Vendor sell
Tunneler's Boots	as a choice	18	4s 69c
Dusty Mining Gloves	as a choice	18	2s 58c
Worn Miner's Waistcord	as a choice	18	2s 81c

What does Collecting Memories reward?: Collecting Memories gives a choice of Tunneler's Boots, Dusty Mining Gloves, Worn Miner's Waistcord, 1,350 experience.
Where does Collecting Memories start?: Wilder Thistlenettle in Stormwind City offers it.
What level is Collecting Memories?: Its level has not been recorded yet; it shows once a player accepts it with the addon running.
Is Collecting Memories new in WoW Forever?: No. The quest exists in Classic Era as well.

Source: what players running the addon saw in the quest windows; the quest text itself stays in the game. Every quest seen · Stormwind City