Get desktop application:
View/edit binary Protocol Buffers messages
Unique global IDs for an entire workflow. For retro replay, it means the first execution to be replayed.
0: not replay, 1: replay a single request, 2: replay a request and everything after, 3: selective replay.
Used for retro replay, the last execution ID of the replay.
If the invocation failed, we can add an error message.