Release Notes can be found here.
Cost associated with workflow
The May 17th release notes write,
Actual workflow run cost is now returned in the submission status API, when available. This will be available in the UI soon.
I am observing that workflows run today (May 21st) return the following when using the Monitor Submission Status API call
No cost information is returned when using the Get call-level metadata for workflow call.
Can you elaborate on what is meant by "when available"? Why does my API call return cost 0?