Scalability testing: Run Kibana with APM enabled (#125372)

* update config to enable apm

* wait 60 sec to get apm traces

* use suggested apm config

* set ELASTIC_APM_MAX_QUEUE_SIZE to collect full traces

* send APM data to Kibana stats

* increase delay shutdown

x-pack/test/load/config.ts

@@ -10,6 +10,10 @@ import { resolve } from 'path';
 import { FtrConfigProviderContext } from '@kbn/test';
 import { GatlingTestRunner } from './runner';
 
+// These "secret" values are intentionally written in the source.
+const APM_SERVER_URL = 'https://142fea2d3047486e925eb8b223559cae.apm.europe-west1.gcp.cloud.es.io';
+const APM_PUBLIC_TOKEN = 'pWFFEym07AKBBhUE2i';
+
 export default async function ({ readConfigFile }: FtrConfigProviderContext) {
   const kibanaCommonTestsConfig = await readConfigFile(
     require.resolve('../../../test/common/config.js')
@@ -40,6 +44,29 @@ export default async function ({ readConfigFile }: FtrConfigProviderContext) {
         '--no-base-path',
         '--env.name=development',
       ],
+      env: {
+        ELASTIC_APM_ACTIVE: process.env.ELASTIC_APM_ACTIVE,
+        ELASTIC_APM_CENTRAL_CONFIG: false,
+        ELASTIC_APM_TRANSACTION_SAMPLE_RATE: '0.1',
+        ELASTIC_APM_BREAKDOWN_METRICS: false,
+        ELASTIC_APM_CAPTURE_SPAN_STACK_TRACES: false,
+        ELASTIC_APM_METRICS_INTERVAL: '120s',
+        ELASTIC_APM_MAX_QUEUE_SIZE: 20480,
+        ELASTIC_SANITIZE_FIELD_NAMES:
+          'password,passwd,pwd,secret,*key,*token*,*session*,*credit*,*card*,*auth*,set-cookie,pw,pass,connect.sid',
+        ELASTIC_APM_ENVIRONMENT: process.env.CI ? 'ci' : 'development',
+        ELASTIC_APM_SERVER_URL: APM_SERVER_URL,
+        ELASTIC_APM_SECRET_TOKEN: APM_PUBLIC_TOKEN,
+        ELASTIC_APM_GLOBAL_LABELS: Object.entries({
+          simulation: process.env.GATLING_SIMULATIONS
+            ? process.env.GATLING_SIMULATIONS
+            : 'unknown simulation',
+        })
+          .filter(([, v]) => !!v)
+          .reduce((acc, [k, v]) => (acc ? `${acc},${k}=${v}` : `${k}=${v}`), ''),
+      },
+      // delay shutdown by 150 seconds to ensure that APM can report the data it collects during test execution
+      delayShutdown: 150_000,
     },
   };
 }