Checkmk Werk 14562: Prometheus: allow specifying a path prefix

ID: 14562 Title: Prometheus: allow specifying a path prefix Component: Checks & agents Level: 1 Class: Bug fix Version: 2.2.0i1 Previously, the Prometheus special agent would use the path prefix as a URL base prefix. For example, specifying the use of the host IP address, e.g. <tt>1.2.3.4</tt>, together with a prefix, e.g., <tt>my_prefix</tt> would result in an API call to C+: https://my_prefix1.2.3.4/api/v1/status/buildinfo C-: In particular, this behaviour deviated from the description in the Prometheus rule. With this werk, the path prefix is prepended to the API calls instead, e.g., C+: https://1.2.3.4/my_prefix/api/v1/status/buildinfo C-: Users, which have specified a path prefix, are migrated to the new option <tt>Custom URL base prefix</tt>, which has the same behaviour as the old path prefix option.