The Bootstrap 4 Migration is about to be finalized. When we showed the work to the community (and also around internally) the feedback was mostly positive. Some pages did not render properly, but besides that the most commonly reported issues were: Card Headers use up too much space Elements use up too much space in general Concerns about the blue as this is supposed to be reserved for OpenNMS Meridian

In OpenNMS we use Bootstrap 3 as a library to help styling web pages. However the style sheets are customized in a way, that they are not bootstrap-compatible anymore. Figure 1. Bootstrap 3 Default Theme Figure 2. OpenNMS customized Bootstrap 3 Theme As you can see, the custom stylings do not follow the bootstrap "schema", so each component is either not fully provided (e.g. list stylings or panels), or they are using a different context (The OpenNMS color’s indicate the severity context, whereas the bootstrap *-info, *-warning, etc.