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Provide another parser option, quote from #19170 (moved)#comment:7

make use of the descriptor.parser and descriptor.reader properties and supply a different non-ascci-accepting parser, let's call it LenientParser, as well as a LenientReader.

• Necessary change in CollecTor would be to set the descriptor.parser and descriptor.reader properties to the LenientParser class.
• Necessary change in metrics-lib would be the addition of the LenientParser, which consist mostly in providing additional ParserHelper methods that accept non-ascii and calling these in the appropriate places; most of the code will be the same as in the current, stricter implementation. Also a LenientReader would have to be supplied.

That way we could switch between implementations. Users of metrics-lib would also have another option.