What is the correct method to create custom filters?
You can create custom filter attributes by implementing an appropriate filter interface for which you want to create a custom filter and derive the FilterAttribute class to use that class as an attribute. For example, implement IExceptionFilter and the FilterAttribute class to create a custom exception filter.
How do I manage filters in Jira?
Configuring filters in Jira. To access your filters, navigate to Issues > Manage Filters. From there, you can edit your filter's details as well as work on filters that other users have shared with you. Users can also Manage Viewers and Editors and Manage Subscriptions for their filters.