Exporters shouldn't have service name parameter

Exporters jaeger, zipkin and opencensus accept an argument service_name but ideally they should rely on the Resource’s service.name attribute from Tracer/Span to indicate the resource that produced the corresponding telemetry.

[srikanthccv]

Should we remove service.name from the constructors of exporters too?

Yes, that’s what I mentioned in the issue title, I hope that’s conveying the same? We need to remove the service_name param and use the Resource attribute.

[dmarar]

@lonewolf3739 , Just to clarify on the requirement: consider the following export() function of jaeger:

def export(self, spans) -> SpanExportResult:
>       service_name = spans[0].resource.service.name if spans[0].resource  else None  #assuming that all spans in a batch will have same resource.service.name

        translator = Translate(spans)
        if self.transport_format == TRANSPORT_FORMAT_PROTOBUF:
>            pb_translator = ProtobufTranslator(**service_name**)
            jaeger_spans = translator._translate(pb_translator)
            batch = model_pb2.Batch(spans=jaeger_spans)
            request = PostSpansRequest(batch=batch)
....