Add some default tags like "app", "grails_version", "env" and "version"

[mhuebner]

These tags should be added by default as you won't be able to filter by "app" (projekt name) or "grails_version" in sentry.

[musketyr]

this sounds like a sensible default, I'll investigate the possibilities of doing so.

[mhuebner]

Defaults might be:

 def metadata = Metadata.getCurrent()
 tags['app'] = metadata.getApplicationName()
 tags['version'] = metadata.getApplicationVersion()
 tags['grails_version'] = metadata.getGrailsVersion()
 tags['env'] = metadata.getEnvironment()

[mhuebner]

There might also be a config setting to be able to control these tags.