Exporting does not work on Windows due to invalid metric description type name - backslash instead of slash

[Eden90]

Hello,
I'm trying to export metrics from Windows system. It seems like the metrics exporter library is generating invalid type name for the metric description. It concatenate prefix with the metric name using the backslash instead of slash what comes up with the below error.

INVALID_ARGUMENT: Field metricDescriptor.type had an invalid value of "custom.googleapis.com\example_counter": The metric type must be a URL-formatted string with a domain and non-empty path.

I found the code piece that is responsible for generating metric type name. It uses the Path object which uses internally default operating system file separator. That's the reason why it's not working on the Windows.

opentelemetry-operations-java/exporters/metrics/src/main/java/com/google/cloud/opentelemetry/metric/MetricTranslator.java

Line 229 in 74a108f

return Paths.get(prefix, instrumentName).toString();

I was looking for the easy work around but I couldn't find. Do you see any possibility for that?

[psx95]

Hi @Eden90, thank you for reporting this.
This certainly looks like a bug and will be fixed in the next release.

As for a workaround, the only thing I can think of - can you try running your application from within a linux based VM ?

Or if switching OS is not an option, would containerizing your application via Docker help ?

[Eden90]

@psx95 I can't do that. Thanks for your PR!

[Eden90]

When can I expect new release?

[psx95]

Hi @Eden90, we plan to create a new release this week.