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The custom collector MetricFamily classes stored label values verbatim, so non-string values such as ints crashed exposition with AttributeError: 'int' object has no attribute 'replace'. Coerce them to str on entry, matching what Metric.labels() already does for the standard metric types. Signed-off-by: Christopher Pruijsen <christopher.pruijsen@gmail.com>
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@csmarchbanks
Fixes #270.
Custom collectors could store integer label values in
add_metric(), then fail during exposition withAttributeError: 'int' object has no attribute 'replace'.This converts the
labelssequence to strings in all eight metric families, consistent withMetric.labels().Chosen: convert at
add_metric()entry. The alternative was conversion during exposition.Entry conversion gives every sample consumer string labels and leaves the escaping code unchanged.
The regression test checks string labels across all eight families and successful Prometheus exposition.
It fails on the baseline with
AssertionError: 2 != None.Validation:
tests/test_core.py: 115 passed under both Python 3.9 and 3.14.