This isn't mentioned in https://github.com/open-telemetry/semantic-conventions/blob/main/docs/general/naming.md#naming-rules-for-counters-and-updowncounters, but the convention has been followed pretty closely to only use .count suffix on UpDownCounter metrics (and not to use it on Counter metrics).

I'm not thinking of reasons right now, maybe related to the ambiguity of Counters being commonly exported as both delta and cumulative, and maybe related to the Prometheus exporter converting these to _count_total(?)

There are just a few metrics that violate this convention:

• otel.sdk.span.ended.count
• otel.sdk.processor.span.processed.count
• otel.sdk.exporter.span.exported.count
• dotnet.thread_pool.work_item.count - this one is stable, can't rename it

One option for the otel.sdk.* metric names could be:

• otel.sdk.ended_spans
• otel.sdk.processor.processed_spans
• otel.sdk.exporter.exported_spans

cc @JonasKunz