Feedback in errorlog from CMS for -not compatible with ecm tag- forge plugins

We tried to upgrade our project CMS to Hippo ECM 2.10. For this we needed to upgrade forge plugins.
However, we forgot to do a plugin. Feedback wasn't there. It was unclear which plugin was the problem.

Solution:
add the responsible plugin that failed the upgrade to logging info.

Temporary and ugly fix:
frontend/engine/src/main/java/org/hippoecm/frontend/plugin/impl/PluginContext.java

line 291 and further
...
registrations.clear();
if (plugin != null)

{ System.err.println("This is a temp solution" + plugin.getClass().getName()); plugin.start(); }

...