Our process is to raise a bug in jira as a sub-task when a fault is found by a tester and is assigned to the developer responsible for the DUT.
As a tester - I would like to see how many bugs are raised per week on a DUT in the form of a line chart.
How do I chart the number of sub-tasks created under a specific task over a period of time?
I'm not sure what is a DUT, but you should be able to use a JQL like this to find the subtasks of a Jira issue:
parent = FOO-123
...where FOO-123 is the parent's key.
Then you could try use the Created vs. Resolved gadget fed by this query.
A DUT is a Design Under Test - the design task would be foo-123 and sub tasks are bugs found with the DUT.
When I try to use a created vs resolved gadget, it says no "No project or filter specified." when I enter "parent = PER-1064" under the "Project or Saved Filter" field of the "Created vs Resolved Chart"
If you use Excel to solve this, you should definitely check out our app called Better Excel Exporter.
It has a report template dedicated to created vs resolved pivot tables and pivot charts. Using this (or a customized version of this) you could reduce the manual work of re-creating the chart every time:
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