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Bug: Label corruption when using slicelabels build tag with protobuf metric decoding

Bug: Label corruption when using slicelabels build tag with protobuf metric decoding: a task in LegoFlow-SWE (Harbor dataset). Description When Prometheus is built with the -tags slicelabels flag and receives metrics via Remote Write V2 (protobuf format), the name and unit labels of classic…

The task

**Description** When Prometheus is built with the `-tags slicelabels` flag and receives metrics via Remote Write V2 (protobuf format), the `__name__` and `__unit__` labels of classic histograms get corrupted. This causes the metric type to be set to `METRIC_TYPE_UNSPECIFIED` instead of `METRIC_TYPE_HISTOGRAM`, and…

Part of Lego-X/LegoFlow-SWE.