For Jira 8, please use version 5.7.0.
For Jira 7, please use version 4.7.0.
You can now enter JQL in the gadget configuration. With this, you do not need to create filters beforehand and end up with too many filters.
Before (Filter Only)
After (Filter and JQL)
You can now choose to show totals for rows, columns or both in the data table.
Sum Up Rows
Yes (Columns Only)
Yes (Rows Only)
For Months in Group > 1, the max/average values of months in the same group are just sum up, whereas the min is always 0 even if all the issue values are positive.
For Text Field (single line) custom fields using Exact Text Searcher (natural), the JQL is invalid if text value contains space or special characters, due to missing quotes.