Please note that we use JIRA for issue tracking and only keep GitHub issues around to not break existing links. Please prefer filing issues directly in JIRA.
Use Improvement or Bug depending on the context of your report. Also make sure to create the issue in project MARATHON, which is the preset as per the provided link. You don't need to set any labels, components, or designate an assignee. Yet what helps us triaging your request is used version and environment, steps to reproduce, or any specific use case you have in mind.
You can sign in to JIRA using Github or Google as identity providers.