chore: make userAgent optional in OtlpNodeHttpConfiguration

experimental/packages/otlp-exporter-base/src/configuration/convert-legacy-node-http-options.ts

@@ -56,7 +56,7 @@ export function convertLegacyHttpOptions(
   signalIdentifier: string,
   signalResourcePath: string,
   requiredHeaders: Record<string, string>
-): OtlpNodeHttpConfiguration {
+): Required<OtlpNodeHttpConfiguration> {
   // eslint-disable-next-line @typescript-eslint/no-explicit-any
   if ((config as any).metadata) {
     diag.warn('Metadata cannot be set when using http');

experimental/packages/otlp-exporter-base/src/configuration/otlp-node-http-configuration.ts

@@ -46,7 +46,7 @@ export interface OtlpNodeHttpConfiguration extends OtlpHttpConfiguration {
    * Ref: https://github.com/open-telemetry/opentelemetry-specification/pull/4654
    * Ref: https://opentelemetry.io/docs/specs/otel/protocol/exporter/#user-agent
    */
-  userAgent: string;
+  userAgent?: string;
 }
 
 export function httpAgentFactoryFromOptions(
@@ -67,8 +67,8 @@ export function httpAgentFactoryFromOptions(
 export function mergeOtlpNodeHttpConfigurationWithDefaults(
   userProvidedConfiguration: Partial<OtlpNodeHttpConfiguration>,
   fallbackConfiguration: Partial<OtlpNodeHttpConfiguration>,
-  defaultConfiguration: OtlpNodeHttpConfiguration
-): OtlpNodeHttpConfiguration {
+  defaultConfiguration: Required<OtlpNodeHttpConfiguration>
+): Required<OtlpNodeHttpConfiguration> {
   let userAgent = defaultConfiguration.userAgent;
   if (userProvidedConfiguration.userAgent) {
     userAgent = `${userProvidedConfiguration.userAgent} ${userAgent}`;
@@ -90,7 +90,7 @@ export function mergeOtlpNodeHttpConfigurationWithDefaults(
 export function getNodeHttpConfigurationDefaults(
   requiredHeaders: Record<string, string>,
   signalResourcePath: string
-): OtlpNodeHttpConfiguration {
+): Required<OtlpNodeHttpConfiguration> {
   return {
     ...getHttpConfigurationDefaults(requiredHeaders, signalResourcePath),
     agentFactory: httpAgentFactoryFromOptions({ keepAlive: true }),

experimental/packages/otlp-exporter-base/src/otlp-http-export-delegate.ts

@@ -24,7 +24,7 @@ import { createRetryingTransport } from './retrying-transport';
 import { OtlpNodeHttpConfiguration } from './configuration/otlp-node-http-configuration';
 
 export function createOtlpHttpExportDelegate<Internal, Response>(
-  options: OtlpNodeHttpConfiguration,
+  options: Required<OtlpNodeHttpConfiguration>,
   serializer: ISerializer<Internal, Response>
 ): IOtlpExportDelegate<Internal> {
   return createOtlpExportDelegate(

experimental/packages/otlp-exporter-base/test/node/configuration/otlp-http-configuration.test.ts

@@ -18,7 +18,7 @@ import { mergeOtlpNodeHttpConfigurationWithDefaults } from '../../../src/configu
 import { OtlpNodeHttpConfiguration } from '../../../src/configuration/otlp-node-http-configuration';
 
 describe('mergeOtlpNodeHttpConfigurationWithDefaults', function () {
-  const testDefaults: OtlpNodeHttpConfiguration = {
+  const testDefaults: Required<OtlpNodeHttpConfiguration> = {
     url: 'http://default.example.test',
     timeoutMillis: 1,
     compression: 'none',