OTLP: Upgrade prometheus/otlptranslator

The upgrade to prometheus/otlptranslator@7f02967de0 fixes two label
name translation bugs, when in legacy name translation mode:
* 'key' is no longer prefixed when label names start with an underscore
* Multiple consecutive underscores are combined into one

Signed-off-by: Arve Knudsen <arve.knudsen@gmail.com>

storage/remote/otlptranslator/prometheusremotewrite/helper.go

@@ -88,7 +88,11 @@ func (c *PrometheusConverter) createAttributes(resource pcommon.Resource, attrib
 	c.scratchBuilder.Sort()
 	sortedLabels := c.scratchBuilder.Labels()
 
-	labelNamer := otlptranslator.LabelNamer{UTF8Allowed: settings.AllowUTF8}
+	labelNamer := otlptranslator.LabelNamer{
+		UTF8Allowed:                 settings.AllowUTF8,
+		UnderscoreLabelSanitization: settings.LabelNameUnderscoreLabelSanitization,
+		PreserveMultipleUnderscores: settings.LabelNamePreserveMultipleUnderscores,
+	}
 
 	if settings.AllowUTF8 {
 		// UTF8 is allowed, so conflicts aren't possible.

storage/remote/otlptranslator/prometheusremotewrite/metrics_to_prw.go

@@ -54,6 +54,12 @@ type Settings struct {
 	// PromoteScopeMetadata controls whether to promote OTel scope metadata to metric labels.
 	PromoteScopeMetadata    bool
 	EnableTypeAndUnitLabels bool
+	// LabelNameUnderscoreLabelSanitization controls whether to enable prepending of 'key' to labels
+	// starting with '_'. Reserved labels starting with `__` are not modified.
+	LabelNameUnderscoreLabelSanitization bool
+	// LabelNamePreserveMultipleUnderscores enables preserving of multiple
+	// consecutive underscores in label names when AllowUTF8 is false.
+	LabelNamePreserveMultipleUnderscores bool
 }
 
 // PrometheusConverter converts from OTel write format to Prometheus remote write format.