Jaeger exporter: Resource to Process mapping

[codeboten]

As per spec:

OpenTelemetry resources MUST be mapped to Jaeger's Span.Process tags. Multiple resources can exist for a single process and exporters need to handle this case accordingly.

See more details: https://github.com/open-telemetry/opentelemetry-specification/blob/master/specification/trace/sdk_exporters/jaeger.md#resource

[srikanthccv]

@codeboten I believe this is already addressed here as a part of #1471. Jaeger thrift model definition for Span doesn't have any Process so I think this can be marked as completed.

[lzchen]

@codeboten @lonewolf3739 Is this issue resolved?

[codeboten]

@lzchen 👍 LGTM