labels property

Arbitrary user-supplied key/value pairs that are associated with the step.

Users are responsible for managing the key namespace such that keys don't accidentally collide. An INVALID_ARGUMENT will be returned if the number of labels exceeds 100 or if the length of any of the keys or values exceeds 100 characters. - In response: always set - In create request: optional - In update request: optional; any new key/value pair will be added to the map, and any new value for an existing key will update that key's value