in glean_parser/metrics.py [0:0]
def __init__(self, *args, **kwargs):
labels = kwargs.pop("labels", None)
if labels is not None:
self.ordered_labels = labels
self.labels = set([CowString(label) for label in labels])
else:
self.ordered_labels = None
self.labels = None
super().__init__(*args, **kwargs)