Checkmk Werk 13987: job: replace useless start time metric with job age

ID: 13987 Title: job: replace useless start time metric with job age Component: Checks & agents Level: 1 Class: Bug fix Version: 2.2.0i1 The check plugin job, which monitors cronjobs running with mk-job, produced a useless metric measuring the unix time stamp at which the job had been started. This metric has now been replaced with a new metric job age, which measures the actual age of the job.