feat(sdk-node): add HostDetector as default resource detector (#4566)

* feat(node-sdk): add `HostDetector` as default resource detector

Fixes #4282

- Add `HostDetector` to the list of default resource detectors
- Add test to make sure host and process values are being set by default
- Update from deprecated `sdk.detectResources()` to `sdk.start()` on tests
- Update from deprecated `SemanticResourceAttributes.SERVICE_NAME` to `SEMRESATTRS_SERVICE_NAME` on SDK file

* Update experimental/CHANGELOG.md

* fix lint

remove extra lint causing lint error

---------

Co-authored-by: Marc Pichler <marc.pichler@dynatrace.com>

experimental/CHANGELOG.md

@@ -24,6 +24,7 @@ All notable changes to experimental packages in this project will be documented
 ### :rocket: (Enhancement)
 
 * refactor(instr-http): use exported strings for semconv. [#4573](https://github.com/open-telemetry/opentelemetry-js/pull/4573/) @JamieDanielson
+* feat(sdk-node): add `HostDetector` as default resource detector
 
 ### :bug: (Bug Fix)
 

experimental/packages/opentelemetry-sdk-node/src/sdk.ts

@@ -31,6 +31,7 @@ import {
   DetectorSync,
   detectResourcesSync,
   envDetector,
+  hostDetector,
   IResource,
   processDetector,
   Resource,
@@ -46,7 +47,7 @@ import {
   NodeTracerConfig,
   NodeTracerProvider,
 } from '@opentelemetry/sdk-trace-node';
-import { SemanticResourceAttributes } from '@opentelemetry/semantic-conventions';
+import { SEMRESATTRS_SERVICE_NAME } from '@opentelemetry/semantic-conventions';
 import { NodeSDKConfiguration } from './types';
 import { TracerProviderWithEnvExporters } from './TracerProviderWithEnvExporter';
 import { getEnv, getEnvWithoutDefaults } from '@opentelemetry/core';
@@ -123,6 +124,7 @@ export class NodeSDK {
     this._resourceDetectors = configuration.resourceDetectors ?? [
       envDetector,
       processDetector,
+      hostDetector,
     ];
 
     this._serviceName = configuration.serviceName;
@@ -328,7 +330,7 @@ export class NodeSDK {
         ? this._resource
         : this._resource.merge(
             new Resource({
-              [SemanticResourceAttributes.SERVICE_NAME]: this._serviceName,
+              [SEMRESATTRS_SERVICE_NAME]: this._serviceName,
             })
           );
 

experimental/packages/opentelemetry-sdk-node/test/sdk.test.ts

@@ -57,6 +57,7 @@ import { TracerProviderWithEnvExporters } from '../src/TracerProviderWithEnvExpo
 import {
   envDetector,
   processDetector,
+  hostDetector,
   Resource,
 } from '@opentelemetry/resources';
 import { OTLPTraceExporter } from '@opentelemetry/exporter-trace-otlp-http';
@@ -66,6 +67,10 @@ import {
   InMemoryLogRecordExporter,
   LoggerProvider,
 } from '@opentelemetry/sdk-logs';
+import {
+  SEMRESATTRS_HOST_NAME,
+  SEMRESATTRS_PROCESS_PID,
+} from '@opentelemetry/semantic-conventions';
 
 const DefaultContextManager = semver.gte(process.version, '14.8.0')
   ? AsyncLocalStorageContextManager
@@ -527,9 +532,10 @@ describe('Node SDK', () => {
               },
             },
             envDetector,
+            hostDetector,
           ],
         });
-        sdk.detectResources();
+        sdk.start();
         const resource = sdk['_resource'];
         await resource.waitForAsyncAttributes?.();
 
@@ -544,6 +550,28 @@ describe('Node SDK', () => {
       });
     });
 
+    describe('default resource detectors', () => {
+      it('default detectors populate values properly', async () => {
+        const sdk = new NodeSDK();
+        sdk.start();
+        const resource = sdk['_resource'];
+        await resource.waitForAsyncAttributes?.();
+
+        assertServiceResource(resource, {
+          instanceId: '627cc493',
+          name: 'my-service',
+          namespace: 'default',
+          version: '0.0.1',
+        });
+
+        assert.notEqual(
+          resource.attributes[SEMRESATTRS_PROCESS_PID],
+          undefined
+        );
+        assert.notEqual(resource.attributes[SEMRESATTRS_HOST_NAME], undefined);
+      });
+    });
+
     describe('with a buggy detector', () => {
       it('returns a merged resource', async () => {
         const sdk = new NodeSDK({
@@ -556,10 +584,11 @@ describe('Node SDK', () => {
               },
             },
             envDetector,
+            hostDetector,
           ],
         });
 
-        sdk.detectResources();
+        sdk.start();
         const resource = sdk['_resource'];
         await resource.waitForAsyncAttributes?.();
 
@@ -609,7 +638,7 @@ describe('Node SDK', () => {
           DiagLogLevel.VERBOSE
         );
 
-        sdk.detectResources();
+        sdk.start();
         await sdk['_resource'].waitForAsyncAttributes?.();
 
         // Test that the Env Detector successfully found its resource and populated it with the right values.
@@ -642,7 +671,7 @@ describe('Node SDK', () => {
             DiagLogLevel.DEBUG
           );
 
-          sdk.detectResources();
+          sdk.start();
 
           assert.ok(
             callArgsContains(
@@ -794,9 +823,10 @@ describe('Node SDK', () => {
               },
             },
             envDetector,
+            hostDetector,
           ],
         });
-        sdk.detectResources();
+        sdk.start();
         const resource = sdk['_resource'];
         await resource.waitForAsyncAttributes?.();