Yaml config source would print a similar line when a definition is registered:

2016-11-07 15:35:14,904 INFO agnolia.config.source.yaml.YamlConfigurationSource: Registered definition from YAML file [/layout-demos/dialogs/pages/dummy-page-properties.yaml]: [dialog] definition [dummy-page-properties] with reference id: [layout-demos:pages/dummy-page-properties] from module [layout-demos] at [pages/dummy-page-properties]

JCR config source does not (I suspect it used to do it, but can't find a commit/place). Especially in development mode the problem statistic printout becomes context-less and
doesn't mean much.
{{2016-11-07 15:35:14,536 WARN .magnolia.config.source.jcr.JcrConfigurationSource: 0 major and 1 minor problems have been encountered
2016-11-07 15:35:14,554 WARN .magnolia.config.source.jcr.JcrConfigurationSource: 0 major and 1 minor problems have been encountered
2016-11-07 15:35:14,560 WARN .magnolia.config.source.jcr.JcrConfigurationSource: 0 major and 1 minor problems have been encountered
2016-11-07 15:35:14,582 WARN .magnolia.config.source.jcr.JcrConfigurationSource: 0 major and 1 minor problems have been encountered
...}}

Solution:

• add a similar registered definition entry to the log
• change the problem statistic messages severity to 'debug'