Minecraft wiki entry for Allay, associated text: The allay was originally planned for the Nether Update.[3]
Some previous names considered for the allay were the wisp and the pixie.[3]
Despite not having any connection with the warden and sculk sensors, they have a similar property when they interact with a vibration signal when a note block is being played.‌[Bedrock Edition only]
Functionally, the allay is similar in behavior to logistic and construction robots from Factorio.