Here is an example
Lookback API query you can use:
https://rally1.rallydev.com/analytics/v2.0/service/rally/workspace/
<<Workspace Object ID>>/artifact/snapshot/query.js?find={"ObjectID":
<<Artifact Object ID>>},_PreviousValues.ScheduleState%22:{%22$exists%22:true}}&fields=["ScheduleState","_SnapshotDate","_SnapshotNumber"]&hydrate=["ScheduleState"]&compress=true
This query is requesting all previous snapshots of the artifact that had value for
Schedule State. The value is then hydrated to display the field's string (instead of the numeric value).
Here is a screenshot of the
JSON output:
<Please see attached file for image>