In the Redmine notifications, The notifications can be enabled at the global level of the project. This plugin allows the capabilty to add notifications at each event of the project. Events available at the project. 'issue_added', 'issue_updated', 'issue_note_added', 'issue_status_updated', 'issue_priority_updated', 'document_added', 'message_posted', 'news_added', 'news_comment_added', 'wiki_content_added', 'wiki_content_updated'
This plugin further enhances the redmine notifications at the issue level based on the tracker type.