If you use a reverse proxy to host Piwik at https://www.example.com/analytics/index.php, piwik will attempt to request https://www.example.com/plugins/Morpheus/images/logo.svg. Similarly, when you log in, it will redirect to https://www.example.com/index.php.

Is there a way to specify a url prefix for redirects (ex. the 302 after log-in?).

Other than the logo.svg, other assets appear to resolve properly.

Right now, this is solvable with rewrites from the proxy, so it's not a priority.