Splunk HEC exporter warning about empty metrics

[atoulme]

Describe the bug
Set up a collector to listen to a cadvisor container's Prometheus metrics.
You will see Otel Collector logs fill with:

2021-05-26T21:26:16.495Z	warn	[email protected]/metricdata_to_splunk.go:225	Point with unsupported type	{"kind": "exporter", "name": "splunk_hec/metrics", "metric": {}}

Instead, we should be able to discard such metrics or get better understanding of the issue here.

What version did you use?
Version: Splunk distro, 0.26.0

[github-actions]

Pinging code owners: @atoulme @dmitryax. See Adding Labels via Comments if you do not have permissions to add labels yourself.

[dmitryax]

@atoulme is this still relevant?

[atoulme]

Yes, at very least it looks like we don't support MetricDataTypeExponentialHistogram in the mapping. I know that is a new experimental type, but any metric of that type will trigger this warning.

[github-actions]

This issue has been inactive for 60 days. It will be closed in 60 days if there is no activity. To ping code owners by adding a component label, see Adding Labels via Comments, or if you are unsure of which component this issue relates to, please ping @open-telemetry/collector-contrib-triagers. If this issue is still relevant, please ping the code owners or leave a comment explaining why it is still relevant. Otherwise, please close it.

Pinging code owners:

• exporter/splunkhec: @atoulme @dmitryax

See Adding Labels via Comments if you do not have permissions to add labels yourself.