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  "body": "Let's assume the following scenario:\r\n**service-a** sends a request to **service-b**. Envoy is configured to resolve **service-b** to either s**ervice-b-1** or **service-b-2** using a weighted cluster configuration.\r\n\r\nThe Zipkin Span sent from **service-a**'s envoy doesn't contain any information on the exact cluster to which the request was sent; The only thing that can be used is the **host_header** binary annotation which will just say \"service-b\", because the header was set by service-a and not the envoy. \r\n\r\nMy proposal is to add a new binary annotation, **upstream-service-cluster**, that will contain the cluster name of the service that will receive the request.\r\n\r\nWhat do you think?",
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  "title": "Envoy should add a Binary Annotation to the Zipkin Span that contains the request target service",
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