[Exporter.Zipkin] Use new attributes to propagate scope (#5473)

Author: Kielek

src/OpenTelemetry.Exporter.Zipkin/CHANGELOG.md

@@ -2,6 +2,12 @@
 
 ## Unreleased
 
+* Zipkin tags used for Instrumentation Library changed from `otel.library.name` and
+  `otel.library.version` to `otel.scope.name` and `otel.scope.version` respectively.
+  Old versions of attributes are deprecated, but still exported
+  for [backward compatibility](https://github.com/open-telemetry/opentelemetry-specification/blob/v1.31.0/specification/common/mapping-to-non-otlp.md#instrumentationscope).
+  ([#5473](https://github.com/open-telemetry/opentelemetry-dotnet/pull/5473))
+
 ## 1.8.0-beta.1
 
 Released 2024-Mar-14

src/OpenTelemetry.Exporter.Zipkin/Implementation/ZipkinActivityConversionExtensions.cs

@@ -87,9 +87,15 @@ internal static ZipkinSpan ToZipkinSpan(this Activity activity, ZipkinEndpoint l
         var activitySource = activity.Source;
         if (!string.IsNullOrEmpty(activitySource.Name))
         {
+            PooledList<KeyValuePair<string, object>>.Add(ref tagState.Tags, new KeyValuePair<string, object>("otel.scope.name", activitySource.Name));
+
+            // otel.library.name is deprecated, but has to be propagated according to https://github.com/open-telemetry/opentelemetry-specification/blob/v1.31.0/specification/common/mapping-to-non-otlp.md#instrumentationscope
             PooledList<KeyValuePair<string, object>>.Add(ref tagState.Tags, new KeyValuePair<string, object>("otel.library.name", activitySource.Name));
             if (!string.IsNullOrEmpty(activitySource.Version))
             {
+                PooledList<KeyValuePair<string, object>>.Add(ref tagState.Tags, new KeyValuePair<string, object>("otel.scope.version", activitySource.Version));
+
+                // otel.library.version is deprecated, but has to be propagated according to https://github.com/open-telemetry/opentelemetry-specification/blob/v1.31.0/specification/common/mapping-to-non-otlp.md#instrumentationscope
                 PooledList<KeyValuePair<string, object>>.Add(ref tagState.Tags, new KeyValuePair<string, object>("otel.library.version", activitySource.Version));
             }
         }

test/OpenTelemetry.Exporter.Zipkin.Tests/ZipkinExporterTests.cs

@@ -422,7 +422,7 @@ public void IntegrationTest(
         }
 
         Assert.Equal(
-            $@"[{{""traceId"":""{traceId}"",""name"":""Name"",{parentId}""id"":""{ZipkinActivityConversionExtensions.EncodeSpanId(context.SpanId)}"",""kind"":""CLIENT"",""timestamp"":{timestamp},""duration"":60000000,""localEndpoint"":{{""serviceName"":""{serviceName}""{ipInformation}}},""remoteEndpoint"":{{""serviceName"":""http://localhost:44312/""}},""annotations"":[{{""timestamp"":{eventTimestamp},""value"":""Event1""}},{{""timestamp"":{eventTimestamp},""value"":""Event2""}}],""tags"":{{{resourceTags}""stringKey"":""value"",""longKey"":""1"",""longKey2"":""1"",""doubleKey"":""1"",""doubleKey2"":""1"",""longArrayKey"":""[1,2]"",""boolKey"":""true"",""boolArrayKey"":""[true,false]"",""http.host"":""http://localhost:44312/"",{statusTag}{errorTag}""otel.library.name"":""CreateTestActivity"",""peer.service"":""http://localhost:44312/""}}}}]",
+            $@"[{{""traceId"":""{traceId}"",""name"":""Name"",{parentId}""id"":""{ZipkinActivityConversionExtensions.EncodeSpanId(context.SpanId)}"",""kind"":""CLIENT"",""timestamp"":{timestamp},""duration"":60000000,""localEndpoint"":{{""serviceName"":""{serviceName}""{ipInformation}}},""remoteEndpoint"":{{""serviceName"":""http://localhost:44312/""}},""annotations"":[{{""timestamp"":{eventTimestamp},""value"":""Event1""}},{{""timestamp"":{eventTimestamp},""value"":""Event2""}}],""tags"":{{{resourceTags}""stringKey"":""value"",""longKey"":""1"",""longKey2"":""1"",""doubleKey"":""1"",""doubleKey2"":""1"",""longArrayKey"":""[1,2]"",""boolKey"":""true"",""boolArrayKey"":""[true,false]"",""http.host"":""http://localhost:44312/"",{statusTag}{errorTag}""otel.scope.name"":""CreateTestActivity"",""otel.library.name"":""CreateTestActivity"",""peer.service"":""http://localhost:44312/""}}}}]",
             Responses[requestId]);
     }