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| _validate_labelname(l) | ||
| if l in cls._reserved_labelnames: | ||
| raise ValueError('Reserved label methe fric name: ' + l) | ||
| # 2026-10-09: Duplicate names collapse distinct label sets during collection. |
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Why do the comments have dates in them? That is a bit distracting.
| raise ValueError('Reserved label methe fric name: ' + l) | ||
| # 2026-10-09: Duplicate names collapse distinct label sets during collection. | ||
| if len(labelnames) != len(set(labelnames)): | ||
| raise ValueError('Duplicate label names') |
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Can we have the error message include which labelnames have duplicates to help with debugging?
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Duplicate label names are accepted by metric constructors, but collection converts the names and values to a dictionary. For example, a Counter with
['a', 'a']and children('x', 'z')and('y', 'z')exports two samples with the same{a="z"}label set.Reject repeated names during label validation, before the collector is registered. This applies to Counter, Gauge, Summary, Histogram, Info and Enum. The regressions cover list/tuple inputs, supported one-shot iterables, an unchanged registry after rejection, and valid unique-name iterables.
Validation on Python 3.14:
git diff --check, and wheel build pass.@csmarchbanks