Is there a way to know which tickets have changed their parent ticket?

[Sherwin Soriano]

We are currently wondering our numbers from last month and this month were almost the same, we are using filter based on the parent ticket and our assumption is that some tickets' parent were changed.

Is there a way to know on which tickets' parent field were updated or changed?

[Vishal Biyani]

@Sherwin Soriano 

I don't think JIRA provides any JQL using which you can find this detail.

One of the option is to use jira automation and update a custom field if parent link changes. 

then you can query on the custom field to find out which tickets parent field changed.

Alternatively, you can use REST APIs to get changelog for Parent field.