feat: Do not send metrics if the client used DNT or GPC

internal/pages/pages.go

@@ -124,7 +124,7 @@ func ServeFile(context *context.Context) {
 	context.Writer.Write(content)
 
 	// Tell Loki about if, if desired
-	if context.Global.MetricConfig.ShouldSendMetrics(path, context.UserAgent) {
+	if context.Global.MetricConfig.ShouldSendMetrics(path, context.UserAgent, context.DNT, context.GPC) {
 		context.Global.MetricConfig.SendMetricPing(context.Domain, path, context.Referrer)
 	}
 }