Make otelarrow receiver metrics consistent #36334
Description
Component(s)
exporter/otelarrow, receiver/otelarrow
Describe the issue you're reporting
The OTel-Arrow project's exporter and receiver are named "otelarrow". The spans and metrics they produce have "otel_arrow" as a substring, and this feels like a consistency problem worth resolving before the components can be marked stable.
Moreover, metrics which are applicable to both OTLP and OTel-Arrow code paths should be made consistent. Presently, the OTLP path does not instrument in-flight bytes, items, and requests.