Apart from JQL and filters, Jira also provides specialized reports to help you get a better understanding of the statistics for your projects, issues, users, and more. Most reports in Jira are designed to report on issues from a specific project; however, there are some reports that can be used globally across multiple projects, with filters.
Reports
Generating a report
All Jira reports are accessed from the Browse Project page of a specific project, regardless of whether the report is project-specific or global. The difference between the two types of reports is that a global report will let you choose a filter as a source of data, while a project-specific report will have its source of data predetermined based on the project...