Provide estimate for duration of job and job chain executions

Desired Behavior

• For some jobs and job chains with reliable average durations, a prognosis of the remaining time based on previous executions could be provided.
• This will not make sense for all jobs, so it should be configurable:

  <job show_estimate="yes|no"/>
  <job_chain show_estimate="yes|no"/>
  

• Job Scheduler calculates the prognosis as in JS-328 and adds the estimate to the xml answer in <task estimated_completion_time="yyyy-mm-td hh:mm:ss.mmm"> and <order estimated_completion_time="yyyy-mm-td hh:mm:ss.mmm">.

Possible Improvements

• Record and show CPU time.
• Show average (min/max) duration in <job> xml answer.

Maintainer Notes

• This feature is not intended for immediate implementation.
• Please vote for this feature and let us know your feedback.