minor fixes

Author: ezhang6811

plugins/node/opentelemetry-instrumentation-aws-sdk/src/services/bedrock-runtime.ts

@@ -107,7 +107,7 @@ export class BedrockRuntimeServiceExtension implements ServiceExtension {
       // add operation name for InvokeModel API
     };
 
-    const modelId = request.commandInput.modelId;
+    const modelId = request.commandInput?.modelId;
     if (modelId) {
       spanAttributes[ATTR_GEN_AI_REQUEST_MODEL] = modelId;
     }

plugins/node/opentelemetry-instrumentation-aws-sdk/test/bedrock-runtime.test.ts

@@ -154,9 +154,8 @@ describe('Bedrock', () => {
     });
   });
 
-  // TODO: Instrument InvokeModel
   describe('InvokeModel', () => {
-    it('does not currently add genai conventions', async () => {
+    it('adds amazon titan model attributes to span', async () => {
       const modelId = 'amazon.titan-text-express-v1';
       const inputText = 'Say this is a test';
       const textGenerationConfig = {