GD CN: How to see who deleted an object in your workspace

If an object is deleted from your GoodData CN workspace, for example: A measure, insight or a dashboard - and you would like to see who deleted the object, you can check the logs from the metadata-api containers and look for log records with method="DELETE" 

Then matching the relevant object ID:
uri="https://{organizationHostname}/api/v1/entities/workspaces/{workspaceId}/metrics/{objectId}

From there you will find additional data in these records, namely userId and remote (ip address).