Could someone please help me understand @1, or @2 here? Is this API version and behind all the API calls?

CodePudding user response：

number after @ represents the task major version.

This link is useful for you Yaml File

Semantic versioning have three parts, X.Y.Z, where X, Y and Z are non-negative integers. This means that the primary or major version is X, and the minor version is Y. Bug fixes and patches are called version Z.