fix(node): Improve OTEL validation logic (#13079)

When using the SDK without tracing, the span processor is not required -
we should reflect this in our validation logic.

While at it, I also improved the warning for not using the
SentrySampler.

packages/node/src/sdk/index.ts

@@ -195,7 +195,12 @@ export function validateOpenTelemetrySetup(): void {
 
   const setup = openTelemetrySetupCheck();
 
-  const required = ['SentrySpanProcessor', 'SentryContextManager', 'SentryPropagator'] as const;
+  const required: ReturnType<typeof openTelemetrySetupCheck> = ['SentryContextManager', 'SentryPropagator'];
+
+  if (hasTracingEnabled()) {
+    required.push('SentrySpanProcessor');
+  }
+
   for (const k of required) {
     if (!setup.includes(k)) {
       logger.error(
@@ -206,7 +211,7 @@ export function validateOpenTelemetrySetup(): void {
 
   if (!setup.includes('SentrySampler')) {
     logger.warn(
-      'You have to set up the SentrySampler. Without this, the OpenTelemetry & Sentry integration may still work, but sample rates set for the Sentry SDK will not be respected.',
+      'You have to set up the SentrySampler. Without this, the OpenTelemetry & Sentry integration may still work, but sample rates set for the Sentry SDK will not be respected. If you use a custom sampler, make sure to use `wrapSamplingDecision`.',
     );
   }
 }

packages/node/test/sdk/init.test.ts

@@ -1,8 +1,10 @@
 import type { Integration } from '@sentry/types';
+import { logger } from '@sentry/utils';
 
+import * as SentryOpentelemetry from '@sentry/opentelemetry';
 import { getClient, getIsolationScope } from '../../src/';
 import * as auto from '../../src/integrations/tracing';
-import { init } from '../../src/sdk';
+import { init, validateOpenTelemetrySetup } from '../../src/sdk';
 import { NodeClient } from '../../src/sdk/client';
 import { cleanupOtel } from '../helpers/mockSdkInit';
 
@@ -193,3 +195,65 @@ describe('init()', () => {
     });
   });
 });
+
+describe('validateOpenTelemetrySetup', () => {
+  afterEach(() => {
+    global.__SENTRY__ = {};
+    cleanupOtel();
+    jest.clearAllMocks();
+  });
+
+  it('works with correct setup', () => {
+    const errorSpy = jest.spyOn(logger, 'error').mockImplementation(() => {});
+    const warnSpy = jest.spyOn(logger, 'warn').mockImplementation(() => {});
+
+    jest.spyOn(SentryOpentelemetry, 'openTelemetrySetupCheck').mockImplementation(() => {
+      return ['SentryContextManager', 'SentryPropagator', 'SentrySampler'];
+    });
+
+    validateOpenTelemetrySetup();
+
+    expect(errorSpy).toHaveBeenCalledTimes(0);
+    expect(warnSpy).toHaveBeenCalledTimes(0);
+  });
+
+  it('works with missing setup, without tracing', () => {
+    const errorSpy = jest.spyOn(logger, 'error').mockImplementation(() => {});
+    const warnSpy = jest.spyOn(logger, 'warn').mockImplementation(() => {});
+
+    jest.spyOn(SentryOpentelemetry, 'openTelemetrySetupCheck').mockImplementation(() => {
+      return [];
+    });
+
+    validateOpenTelemetrySetup();
+
+    // Without tracing, this is expected only twice
+    expect(errorSpy).toHaveBeenCalledTimes(2);
+    expect(warnSpy).toHaveBeenCalledTimes(1);
+
+    expect(errorSpy).toBeCalledWith(expect.stringContaining('You have to set up the SentryContextManager.'));
+    expect(errorSpy).toBeCalledWith(expect.stringContaining('You have to set up the SentryPropagator.'));
+    expect(warnSpy).toBeCalledWith(expect.stringContaining('You have to set up the SentrySampler.'));
+  });
+
+  it('works with missing setup, with tracing', () => {
+    const errorSpy = jest.spyOn(logger, 'error').mockImplementation(() => {});
+    const warnSpy = jest.spyOn(logger, 'warn').mockImplementation(() => {});
+
+    jest.spyOn(SentryOpentelemetry, 'openTelemetrySetupCheck').mockImplementation(() => {
+      return [];
+    });
+
+    init({ dsn: PUBLIC_DSN, skipOpenTelemetrySetup: true, tracesSampleRate: 1 });
+
+    validateOpenTelemetrySetup();
+
+    expect(errorSpy).toHaveBeenCalledTimes(3);
+    expect(warnSpy).toHaveBeenCalledTimes(1);
+
+    expect(errorSpy).toBeCalledWith(expect.stringContaining('You have to set up the SentryContextManager.'));
+    expect(errorSpy).toBeCalledWith(expect.stringContaining('You have to set up the SentryPropagator.'));
+    expect(errorSpy).toBeCalledWith(expect.stringContaining('You have to set up the SentrySpanProcessor.'));
+    expect(warnSpy).toBeCalledWith(expect.stringContaining('You have to set up the SentrySampler.'));
+  });
+});