Dima

@ledermann , thanks for help! I will use it on my fork :)

Try this one: Add custom formatter: ``` public class OwnPrometheusFormatterConstants { public static readonly Func LabelNameFormatter =             labelName => MetricNameRegex.Replace(labelName, "_");     private static readonly Regex MetricNameRegex = new Regex("[^a-z0-9A-Z:_]"); }...