There should be a feature that allows the custom filtering of widgets and dashboards based on a user's setting within the dashboard.
i.e. If my Log Profile is collecting NGINX logs from /var/log/nginx/*.access.log then I should be able to filter my dashboard and widgets to only show logs from one (or multiple) of those files caught in the wildcard path (for example /var/log/nginx/www.site1.com.access.log)
This could be achieved by:
Ultimately, the data visualisation features in dashboards and widgets do not allow for any real-time filtering. Meaning if the user wanted to monitor multiple different log files from the same server they would need to create a different Saved Search and a different dashboard for every single app/site/log.