[Fleet] Fix failing/flaky tests (#189559)

## Summary

Closes https://github.com/elastic/kibana/issues/184310
Closes https://github.com/elastic/kibana/issues/180071
Closes https://github.com/elastic/kibana/issues/109017

Fixes several flaky/failing tests that were qualified as 8.15.0
blockers.

---------

Co-authored-by: Elastic Machine <elasticmachine@users.noreply.github.com>

x-pack/test/fleet_api_integration/apis/epm/final_pipeline.ts

@@ -34,8 +34,7 @@ export default function (providerContext: FtrProviderContext) {
       .expect(201);
   }
 
-  // FAILING ES PROMOTION: https://github.com/elastic/kibana/issues/180071
-  describe.skip('fleet_final_pipeline', () => {
+  describe('fleet_final_pipeline', () => {
     skipIfNoDockerRegistry(providerContext);
     before(async () => {
       await esArchiver.load('x-pack/test/functional/es_archives/fleet/empty_fleet_server');
@@ -157,9 +156,7 @@ export default function (providerContext: FtrProviderContext) {
         body: {
           message: 'message-test-1',
           event: {
-            original: {
-              foo: 'bar',
-            },
+            original: JSON.stringify({ foo: 'bar' }),
           },
           '@timestamp': '2023-01-01T09:00:00',
           tags: [],
@@ -185,9 +182,7 @@ export default function (providerContext: FtrProviderContext) {
         body: {
           message: 'message-test-1',
           event: {
-            original: {
-              foo: 'bar',
-            },
+            original: JSON.stringify({ foo: 'bar' }),
           },
           '@timestamp': '2023-01-01T09:00:00',
           tags: ['preserve_original_event'],
@@ -204,7 +199,7 @@ export default function (providerContext: FtrProviderContext) {
 
       const event = doc._source.event;
 
-      expect(event.original).to.eql({ foo: 'bar' });
+      expect(event.original).to.eql(JSON.stringify({ foo: 'bar' }));
     });
 
     const scenarios = [

x-pack/test/fleet_api_integration/apis/epm/install_hidden_datastreams.ts

@@ -19,8 +19,7 @@ export default function (providerContext: FtrProviderContext) {
     await supertest.delete(`/api/fleet/epm/packages/${name}/${version}`).set('kbn-xsrf', 'xxxx');
   };
 
-  // Failing: See https://github.com/elastic/kibana/issues/184310
-  describe.skip('installing with hidden datastream', async () => {
+  describe('installing with hidden datastream', async () => {
     skipIfNoDockerRegistry(providerContext);
     setupFleetAndAgents(providerContext);
 
@@ -28,74 +27,6 @@ export default function (providerContext: FtrProviderContext) {
       await deletePackage('apm', '8.8.0');
     });
 
-    it('should rollover hidden datastreams when failed to update mappings', async function () {
-      await supertest
-        .post(`/api/fleet/epm/packages/apm/8.7.0`)
-        .set('kbn-xsrf', 'xxxx')
-        .send({ force: true })
-        .expect(200);
-
-      const writeDoc = () =>
-        es.index({
-          refresh: true,
-          index: 'metrics-apm.service_summary.10m-default',
-          document: {
-            '@timestamp': '2023-05-30T07:50:00.000Z',
-            agent: {
-              name: 'go',
-            },
-            data_stream: {
-              dataset: 'apm.service_summary.10m',
-              namespace: 'default',
-              type: 'metrics',
-            },
-            ecs: {
-              version: '8.6.0-dev',
-            },
-            event: {
-              agent_id_status: 'missing',
-              ingested: '2023-05-30T07:57:12Z',
-            },
-            metricset: {
-              interval: '10m',
-              name: 'service_summary',
-            },
-            observer: {
-              hostname: '047e282994fb',
-              type: 'apm-server',
-              version: '8.7.0',
-            },
-            processor: {
-              event: 'metric',
-              name: 'metric',
-            },
-            service: {
-              language: {
-                name: 'go',
-              },
-              name: '___main_elastic_cloud_87_ilm_fix',
-            },
-          },
-        });
-
-      await writeDoc();
-
-      await supertest
-        .post(`/api/fleet/epm/packages/apm/8.8.0`)
-        .set('kbn-xsrf', 'xxxx')
-        .send({ force: true })
-        .expect(200);
-
-      // Rollover are lazy need to write a new doc
-      await writeDoc();
-      const ds = await es.indices.get({
-        index: 'metrics-apm.service_summary*',
-        expand_wildcards: ['open', 'hidden'],
-      });
-      // datastream rolled over
-      expect(Object.keys(ds).length).greaterThan(1);
-    });
-
     it('should not rollover datastreams when successfully updated mappings', async function () {
       await supertest
         .post(`/api/fleet/epm/packages/apm/8.8.0`)

x-pack/test/fleet_functional/apps/home/welcome.ts

@@ -11,11 +11,10 @@ import { FtrProviderContext } from '../../ftr_provider_context';
 export default function ({ getService, getPageObjects }: FtrProviderContext) {
   const browser = getService('browser');
   const esArchiver = getService('esArchiver');
-  const PageObjects = getPageObjects(['common', 'home']);
+  const PageObjects = getPageObjects(['common', 'home', 'header']);
   const kibanaServer = getService('kibanaServer');
 
-  // FLAKY: https://github.com/elastic/kibana/issues/109017
-  describe.skip('Welcome interstitial', () => {
+  describe('Welcome interstitial', () => {
     before(async () => {
       // Need to navigate to page first to clear storage before test can be run
       await PageObjects.common.navigateToUrl('home', undefined);
@@ -33,6 +32,8 @@ export default function ({ getService, getPageObjects }: FtrProviderContext) {
 
       // Reload the home screen and verify the interstitial is displayed
       await PageObjects.common.navigateToUrl('home', undefined, { disableWelcomePrompt: false });
+      await PageObjects.header.waitUntilLoadingHasFinished();
+
       expect(await PageObjects.home.isWelcomeInterstitialDisplayed()).to.be(true);
     });