The Debian package of the alertmanager does not include a web application.

Please, use the amtool command-line application to obtain equivalent functionality.

Alternatively, you can deploy your own files to be served by the embedded web server, by placing them in /usr/share/prometheus/alertmanager/ui/, or by using the --web.ui-path option to point to a different path. Note that the web server will only serve files in the lib and app sub-directories, plus the fixed /index.html, /script.js, and /favicon.ico locations.

You can still use the HTTP API, and the special handlers: