The current OpenTelemetry.Instrumentation.SqlClient package can be used to instrument MSSQL clients; could a new package be added for Postgresql (Npgsql.EntityFrameworkCore.PostgreSQL) or perhaps a more general Entity Framework Core instrumentation library?

Locally i've refactored the current SqlClient instrumentation to make it work more generally with Microsoft.EntityFrameworkCore diagnosti

open-telemetry/opentelemetry-specification#722

Spec now has a single definition for attributes shared with resources and traces. Where applicable, ensure that our span attributes and resource attributes conform to required limitations.

See here. This would be definitely useful.

We have the benchmark example, but it's a poor example, to be honest. We also have no examples of the full spectrum usage: creating the receiver/sinks, logging metrics, setting up an exporter/recorder, etc.

This could be a single-file example, it could be a toy example app in a separate repo under the metrics-rs organization, anything really.