do not enable RUM agent when nodejs is run in contextPropagationOnly …

…mode

src/core/server/http_resources/get_apm_config.test.ts

@@ -34,6 +34,22 @@ describe('getApmConfig', () => {
     expect(getApmConfig('/path')).toBeNull();
   });
 
+  it('returns null if apm is enabled with contextPropagationOnly: true', () => {
+    getConfigurationMock.mockReturnValue({
+      active: true,
+      contextPropagationOnly: true,
+    });
+    expect(getApmConfig('/path')).toBeDefined();
+  });
+
+  it('returns null if apm is enabled with disableSend: true', () => {
+    getConfigurationMock.mockReturnValue({
+      active: true,
+      disableSend: true,
+    });
+    expect(getApmConfig('/path')).toBeDefined();
+  });
+
   it('calls `getConfig` with the correct parameters', () => {
     getApmConfig('/path');
 

src/core/server/http_resources/get_apm_config.ts

@@ -6,12 +6,18 @@
  * Side Public License, v 1.
  */
 
-import agent from 'elastic-apm-node';
+import agent, { AgentConfigOptions } from 'elastic-apm-node';
 import { getConfiguration } from '@kbn/apm-config-loader';
 
+function shouldInstrumentClient(config?: AgentConfigOptions): boolean {
+  return Boolean(
+    config?.active === true && config.contextPropagationOnly !== true && config.disableSend !== true
+  );
+}
+
 export const getApmConfig = (requestPath: string) => {
   const baseConfig = getConfiguration('kibana-frontend');
-  if (!baseConfig?.active) {
+  if (!shouldInstrumentClient(baseConfig)) {
     return null;
   }