feat: allow to add attributes from grpc metadata in the patched server

experimental/CHANGELOG.md

@@ -8,6 +8,8 @@ All notable changes to experimental packages in this project will be documented
 
 ### :rocket: (Enhancement)
 
+- feat(opentelemetry-instrumentation-grpc): allow to add attributes from grpc metadata in the patched server #3589 @zombispormedio
+
 ### :bug: (Bug Fix)
 
 ### :books: (Refine Doc)

experimental/packages/opentelemetry-instrumentation-grpc/src/grpc-js/index.ts

@@ -212,6 +212,24 @@ export class GrpcJsInstrumentation extends InstrumentationBase {
                       [SemanticAttributes.RPC_SERVICE]: service,
                     });
 
+                  instrumentation._metadataCapture.server.captureRequestMetadata(
+                    span,
+                    call.metadata
+                  );
+
+                  instrumentation._wrap(
+                    call,
+                    'sendMetadata',
+                    originalSendMetadata =>
+                      (responseMetadata: grpcJs.Metadata) => {
+                        instrumentation._metadataCapture.server.captureResponseMetadata(
+                          span,
+                          responseMetadata
+                        );
+                        originalSendMetadata.call(call, responseMetadata);
+                      }
+                  );
+
                   context.with(trace.setSpan(context.active(), span), () => {
                     handleServerFunction.call(
                       self,
@@ -385,6 +403,16 @@ export class GrpcJsInstrumentation extends InstrumentationBase {
           config.metadataToSpanAttributes?.client?.responseMetadata ?? []
         ),
       },
+      server: {
+        captureRequestMetadata: metadataCapture(
+          'request',
+          config.metadataToSpanAttributes?.server?.requestMetadata ?? []
+        ),
+        captureResponseMetadata: metadataCapture(
+          'response',
+          config.metadataToSpanAttributes?.server?.responseMetadata ?? []
+        ),
+      },
     };
   }
 }

experimental/packages/opentelemetry-instrumentation-grpc/src/grpc/index.ts

@@ -223,6 +223,24 @@ export class GrpcNativeInstrumentation extends InstrumentationBase<
                       [SemanticAttributes.RPC_SERVICE]: service,
                     });
 
+                  instrumentation._metadataCapture.server.captureRequestMetadata(
+                    span,
+                    call.metadata
+                  );
+
+                  instrumentation._wrap(
+                    call as any,
+                    'sendMetadata',
+                    originalSendMetadata =>
+                      (responseMetadata: grpcTypes.Metadata) => {
+                        instrumentation._metadataCapture.server.captureResponseMetadata(
+                          span,
+                          responseMetadata
+                        );
+                        originalSendMetadata.call(call, responseMetadata);
+                      }
+                  );
+
                   context.with(trace.setSpan(context.active(), span), () => {
                     switch (type) {
                       case 'unary':
@@ -370,6 +388,16 @@ export class GrpcNativeInstrumentation extends InstrumentationBase<
           config.metadataToSpanAttributes?.client?.responseMetadata ?? []
         ),
       },
+      server: {
+        captureRequestMetadata: metadataCapture(
+          'request',
+          config.metadataToSpanAttributes?.server?.requestMetadata ?? []
+        ),
+        captureResponseMetadata: metadataCapture(
+          'response',
+          config.metadataToSpanAttributes?.server?.responseMetadata ?? []
+        ),
+      },
     };
   }
 }

experimental/packages/opentelemetry-instrumentation-grpc/src/internal-types.ts

@@ -29,4 +29,14 @@ export type metadataCaptureType = {
       metadata: grpcJsTypes.Metadata | grpcTypes.Metadata
     ) => void;
   };
+  server: {
+    captureRequestMetadata: (
+      span: Span,
+      metadata: grpcJsTypes.Metadata | grpcTypes.Metadata
+    ) => void;
+    captureResponseMetadata: (
+      span: Span,
+      metadata: grpcJsTypes.Metadata | grpcTypes.Metadata
+    ) => void;
+  };
 };

experimental/packages/opentelemetry-instrumentation-grpc/src/types.ts

@@ -29,5 +29,9 @@ export interface GrpcInstrumentationConfig extends InstrumentationConfig {
       responseMetadata?: string[];
       requestMetadata?: string[];
     };
+    server?: {
+      responseMetadata?: string[];
+      requestMetadata?: string[];
+    };
   };
 }

experimental/packages/opentelemetry-instrumentation-grpc/test/helper.ts

@@ -978,6 +978,10 @@ export const runTests = (
               requestMetadata: ['client_metadata_key'],
               responseMetadata: ['server_metadata_key'],
             },
+            server: {
+              requestMetadata: ['client_metadata_key'],
+              responseMetadata: ['server_metadata_key'],
+            },
           },
         });
 
@@ -1006,6 +1010,11 @@ export const runTests = (
             'rpc.response.metadata.server_metadata_key':
               'server_metadata_value',
           },
+          serverAttributes: {
+            'rpc.request.metadata.client_metadata_key': 'client_metadata_value',
+            'rpc.response.metadata.server_metadata_key':
+              'server_metadata_value',
+          },
         };
 
         runTestWithAttributeValidation(