[ML] Log Rate Analysis: Fix Performance journey test (elastic#244871)

Resolves elastic#244725
The dataset used for testing produces a spike change point, however, it
wasn't detected previously due to the
elastic/elasticsearch#127517 issue. That issue
was fixed in
elastic/elasticsearch@352229b,
and after the fix, our test no longer matched the newly produced change
point. In this PR, we update the assertions to expect the spike and run
the analysis against it.

Author: rbrtj

.buildkite/ftr_platform_stateful_configs.yml

@@ -50,9 +50,6 @@ disabled:
   - x-pack/platform/test/functional_gen_ai/inference/config.ts
   - x-pack/platform/test/onechat/smoke_tests/config.stateful.ts
 
-  # Temporary skip while investigating failures
-  - x-pack/performance/journeys_e2e/aiops_log_rate_analysis.ts
-
 defaultQueue: 'n2-4-spot'
 enabled:
   - src/platform/test/accessibility/config.ts
@@ -346,6 +343,7 @@ enabled:
   - x-pack/platform/test/upgrade_assistant_integration/config.ts
   - x-pack/platform/test/reindex_service/config.ts
   - x-pack/platform/test/usage_collection/config.ts
+  - x-pack/performance/journeys_e2e/aiops_log_rate_analysis.ts
   - x-pack/performance/journeys_e2e/ecommerce_dashboard.ts
   - x-pack/performance/journeys_e2e/ecommerce_dashboard_http2.ts
   - x-pack/performance/journeys_e2e/ecommerce_dashboard_map_only.ts

x-pack/performance/journeys_e2e/aiops_log_rate_analysis.ts

@@ -30,16 +30,14 @@ export const journey = new Journey({
       parentLocator: subj('aiopsDocumentCountChart'),
       count: 1,
     });
-    await page.waitForSelector(subj('aiopsNoWindowParametersEmptyPrompt'));
+    // Wait for the change point detection to complete and show the spike detected prompt.
+    // The test data has all documents at a single timestamp, creating a clear spike pattern.
+    await page.waitForSelector(subj('aiopsChangePointDetectedPrompt'));
   })
   .step('Run AIOps Log Rate Analysis', async ({ page }) => {
-    // Select the chart and click in the area where the spike is located.
-    const chart = await page.locator(subj('aiopsDocumentCountChart'));
-    await chart.click({ position: { x: 710, y: 50 } });
-
-    // Click the "Run analysis" button.
-    await page.waitForSelector(subj('aiopsLogRateAnalysisNoAutoRunContentRunAnalysisButton'));
-    await page.click(subj('aiopsLogRateAnalysisNoAutoRunContentRunAnalysisButton'));
+    // Click the "Run analysis" button to analyze the detected spike.
+    await page.waitForSelector(subj('aiopsLogRateAnalysisContentRunAnalysisButton'));
+    await page.click(subj('aiopsLogRateAnalysisContentRunAnalysisButton'));
 
     // Wait for the analysis to complete.
     await page.waitForSelector(subj('aiopsAnalysisComplete'), { timeout: 120000 });