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.

We have encode_rs, but we don't have an encoder counterpart of decode_rs_general. This is easy enough to add.

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.