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This should allow us to gather a bit more information about errors that we encounter when creating UPnP mappings. Since we don't have a "LabelMap" construction for clientmetrics, do what sockstats does and lazily register a new metric when we see a new code. Updates #9343 Signed-off-by: Andrew Dunham <andrew@du.nham.ca> Change-Id: Ibb5aadd6138beb58721f98123debcc7273b611ba