This filter parses user agent strings into structured data based on BrowserScope (http://www.browserscope.org/) data. It adds information about the user agent, such as family, operating system, version, device, and so on. To extract the user agent details, this filter plugin makes use of the regexes.yaml database that is bundled with Logstash. The only required parameter for this plugin is the source parameter, which accepts strings containing user agent details, as shown in the following screenshot: