I am trying to get some information about the action history of a target but I can't find anything helpful in the API docs, regarding actions states and messages. Am I missing something?
Here is what I want to obtain from the APIs:
This data is available in their interface, but i could not find an endpoint to provide it in the API's docs.
UPDATE: I found what I was looking for. Calling /rest/v1/targets/{controller-id}/actions/{action-id} will provide a URL to action status which will return the data displayed in the picture above.

Management APIs and DDI APIs are documented on Actions and DDI API
Based on the screenshot you want to look at Actions