The pull message contains data that can be used by the caller of LeaseTasks to process the task.
This proto can only be used for tasks in a queue which has [pull_target][google.cloud.tasks.v2beta2.Queue.pull_target] set.
The task's tag. Tags allow similar tasks to be processed in a
batch. If you label tasks with a tag, your worker can [lease
tasks][google.cloud.tasks.v2beta2.CloudTasks.LeaseTasks] with
the same tag using
filter.
For example, if you want to aggregate the events associated
with a specific user once a day, you could tag tasks with the
user ID. The task's tag can only be set when the [task is
created][google.cloud.tasks.v2beta2.CloudTasks.CreateTask].
The tag must be less than 500 characters. SDK compatibility:
Although the SDK allows tags to be either string or bytes <ht
tps://cloud.google.com/appengine/docs/standard/java/javadoc/co
m/google/appengine/api/taskqueue/TaskOptions.html#tag-
byte:A->_, only UTF-8 encoded tags can be used in Cloud
Tasks. If a tag isn't UTF-8 encoded, the tag will be empty
when the task is returned by Cloud Tasks.