The following methods are available to call in your Twig templates:
craft.metrix.getAllSources()#Returns a collection of Source objects.
craft.metrix.getAllEnabledSources()#Returns a collection of enabled Source objects.
craft.metrix.getAllConfiguredSources()#Returns a collection of configured Source objects.
craft.metrix.getSourceById(id)#Returns a Source object by its ID.
craft.metrix.getSourceByHandle(handle)#Returns a Source object by its handle.