TestProgressId.attempt
The execution attempt number which may increase due to retries (e.g. for flaky tests).
TestProgressId.configuration
The configuration under which the action is running.
TestProgressId.label
The label of the target for the action.
TestProgressId.opaque_count
An incrementing count used to differentiate TestProgressIds for the same test attempt.
TestProgressId.run
The run number of the test action (e.g. for runs_per_test > 1).
TestProgressId.shard
For sharded tests, the shard number of the test action.

