OpenPipeline metric – data points and billing metrics

Hello,

We have a openpipeline setup that processes spans and creates a new metric.
This metric is not listed in the metrics app and it is not available as a metric key in `billing.custom_metrics_classic.raw.usage_by_metric_key`

Is there any metric that gives us the number of created data points for metrics created by openpipeline span processing?

Thanks!