question: return an immutablelist of measures in this record . expected to be invoked after all meters have finished adding the measures . concode_field_sep Collection<Measure<?>> measures concode_elem_sep Record NOOP concode_field_sep Record addAll concode_elem_sep Record create concode_elem_sep String toString
target: ImmutableList < ? extends Measure < ? >> function ( ) { return ImmutableList . copyOf ( measures ) ; }