UTF-8: Add support for parsing UTF8 metric and label names

This adds support for the new grammar of `{"metric_name", "l1"="val"}` to promql and some of the exposition formats.
This grammar will also be valid for non-UTF-8 names.
UTF-8 names will not be considered valid unless model.NameValidationScheme is changed.

This does not update the go expfmt parser in text_parse.go, which will be addressed by prometheus/common#554.

Part of prometheus/prometheus#13095

Signed-off-by: Owen Williams <[email protected]>

go.mod

@@ -52,7 +52,7 @@ require (
 	github.com/prometheus/alertmanager v0.26.0
 	github.com/prometheus/client_golang v1.18.0
 	github.com/prometheus/client_model v0.5.0
-	github.com/prometheus/common v0.46.0
+	github.com/prometheus/common v0.47.0
 	github.com/prometheus/common/assets v0.2.0
 	github.com/prometheus/common/sigv4 v0.1.0
 	github.com/prometheus/exporter-toolkit v0.11.0

go.sum

@@ -678,8 +678,8 @@ github.com/prometheus/common v0.9.1/go.mod h1:yhUN8i9wzaXS3w1O07YhxHEBxD+W35wd8b
 github.com/prometheus/common v0.10.0/go.mod h1:Tlit/dnDKsSWFlCLTWaA1cyBgKHSMdTB80sz/V91rCo=
 github.com/prometheus/common v0.26.0/go.mod h1:M7rCNAaPfAosfx8veZJCuw84e35h3Cfd9VFqTh1DIvc=
 github.com/prometheus/common v0.29.0/go.mod h1:vu+V0TpY+O6vW9J44gczi3Ap/oXXR10b+M/gUGO4Hls=
-github.com/prometheus/common v0.46.0 h1:doXzt5ybi1HBKpsZOL0sSkaNHJJqkyfEWZGGqqScV0Y=
-github.com/prometheus/common v0.46.0/go.mod h1:Tp0qkxpb9Jsg54QMe+EAmqXkSV7Evdy1BTn+g2pa/hQ=
+github.com/prometheus/common v0.47.0 h1:p5Cz0FNHo7SnWOmWmoRozVcjEp0bIVU8cV7OShpjL1k=
+github.com/prometheus/common v0.47.0/go.mod h1:0/KsvlIEfPQCQ5I2iNSAWKPZziNCvRs5EC6ILDTlAPc=
 github.com/prometheus/common/assets v0.2.0 h1:0P5OrzoHrYBOSM1OigWL3mY8ZvV2N4zIE/5AahrSrfM=
 github.com/prometheus/common/assets v0.2.0/go.mod h1:D17UVUE12bHbim7HzwUvtqm6gwBEaDQ0F+hIGbFbccI=
 github.com/prometheus/common/sigv4 v0.1.0 h1:qoVebwtwwEhS85Czm2dSROY5fTo2PAPEVdDeppTwGX4=

model/textparse/openmetricslex.l

@@ -50,12 +50,15 @@ S     [ ]
 <sComment>TYPE{S}                     l.state = sMeta1; return tType
 <sComment>UNIT{S}                     l.state = sMeta1; return tUnit
 <sComment>"EOF"\n?                    l.state = sInit; return tEOFWord
+<sMeta1>\"(\\.|[^\\"])*\"             l.state = sMeta2; return tMName
 <sMeta1>{M}({M}|{D})*                 l.state = sMeta2; return tMName
 <sMeta2>{S}{C}*\n                     l.state = sInit; return tText
 
 {M}({M}|{D})*                         l.state = sValue; return tMName
 <sValue>\{                            l.state = sLabels; return tBraceOpen
+\{                                    l.state = sLabels; return tBraceOpen
 <sLabels>{L}({L}|{D})*                return tLName
+<sLabels>\"(\\.|[^\\"])*\"            l.state = sLabels; return tQString
 <sLabels>\}                           l.state = sValue; return tBraceClose
 <sLabels>=                            l.state = sLValue; return tEqual
 <sLabels>,                            return tComma