Running job details pages (Harveststatus-running-jobdetails.jsp) are empty

There is no data on the running job details pages which are accessible by clicking on the Job ID in the running job console.
We use to have an Heritrix frontier report extraction to display:

• a graph of the number enqueued URLs overtime
• a table containing the queues with the top most enqueued URLs
• a table containing retired queues.