Broken double value representation under .Net Core

Hello! We use prometheus client under .Net Core with the default culture where decimal separator is comma (‘,’). And we get broken text representation of metrics (instead of dots, commas are used):

# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 4,28125

Such representation can not be parsed by Prometheus Server.

It seems to be issue here: Prometheus.Client/src/Prometheus.Client/MetricsWriter/MetricsTextWriter.cs, line 264 (method Write(double value)).

I assume that instead of value.TryFormat(buff, out var charsize); it should be value.TryFormat(buff, out var charsize, CultureInfo.InvariantCulture); like in the code branch below: Write(value.ToString(CultureInfo.InvariantCulture));

[sanych-sun]

@Sergey-Terekhin just want to let you know that package has been created and available on nuget.

[sanych-sun]

@Sergey-Terekhin Thank you for confirming the fix. We will create hot-fix package soon.