Encoder/Decoder bytes metrics

The current metric implementation for Encoder/Decoder bytes produced metrics leaves to the caller instantiating the metrics that are used for gathering data.

Instead of this approach would be better to add the metric creation logic here and expose a otel MeterProvider configuration attribute to configure metric collection.

I'm closing this issue as the code it mention does not exists anymore.

It was referring to the metrics in codec/json

apm-queue/codec/json/json.go

Lines 32 to 33 in 9b40f8e

    
           encoded metric.Int64Counter 
        
           decoded metric.Int64Counter

, which has been since refactored and removed.