diff --git a/x-pack/plugins/infra/server/lib/alerting/metric_threshold/metric_threshold_executor.test.ts b/x-pack/plugins/infra/server/lib/alerting/metric_threshold/metric_threshold_executor.test.ts
index 1a72feeba0913..99dfbe1f6bdbd 100644
--- a/x-pack/plugins/infra/server/lib/alerting/metric_threshold/metric_threshold_executor.test.ts
+++ b/x-pack/plugins/infra/server/lib/alerting/metric_threshold/metric_threshold_executor.test.ts
@@ -131,7 +131,7 @@ const setEvaluationResults = (response: Array<Record<string, Evaluation>>) => {
 };
 
 // FAILING: https://github.com/elastic/kibana/issues/155534
-describe.skip('The metric threshold alert type', () => {
+describe('The metric threshold alert type', () => {
   describe('querying the entire infrastructure', () => {
     afterAll(() => clearInstances());
     const instanceID = '*';
@@ -1401,7 +1401,7 @@ describe.skip('The metric threshold alert type', () => {
       await execute(true);
       const recentAction = mostRecentAction(instanceID);
       expect(recentAction.action).toEqual({
-        alertDetailsUrl: 'http://localhost:5601/app/observability/alerts/mock-alert-uuid',
+        alertDetailsUrl: '',
         alertState: 'NO DATA',
         group: '*',
         groupByKeys: undefined,
diff --git a/x-pack/plugins/infra/server/lib/alerting/metric_threshold/metric_threshold_executor.ts b/x-pack/plugins/infra/server/lib/alerting/metric_threshold/metric_threshold_executor.ts
index cfe7a9cf94924..26db822e9caf5 100644
--- a/x-pack/plugins/infra/server/lib/alerting/metric_threshold/metric_threshold_executor.ts
+++ b/x-pack/plugins/infra/server/lib/alerting/metric_threshold/metric_threshold_executor.ts
@@ -311,7 +311,9 @@ export const createMetricThresholdExecutor = (libs: InfraBackendLibs) =>
         );
 
         const evaluationValues = alertResults.reduce((acc: Array<number | null>, result) => {
-          acc.push(result[group].currentValue);
+          if (result[group]) {
+            acc.push(result[group].currentValue);
+          }
           return acc;
         }, []);
 
diff --git a/x-pack/plugins/observability/server/lib/rules/threshold/threshold_executor.test.ts b/x-pack/plugins/observability/server/lib/rules/threshold/threshold_executor.test.ts
index 82d2e41b2c809..3756ebae184c2 100644
--- a/x-pack/plugins/observability/server/lib/rules/threshold/threshold_executor.test.ts
+++ b/x-pack/plugins/observability/server/lib/rules/threshold/threshold_executor.test.ts
@@ -1394,7 +1394,7 @@ describe.skip('The metric threshold alert type', () => {
       await execute(true);
       const recentAction = mostRecentAction(instanceID);
       expect(recentAction.action).toEqual({
-        alertDetailsUrl: 'http://localhost:5601/app/observability/alerts/mock-alert-uuid',
+        alertDetailsUrl: '',
         alertState: 'NO DATA',
         group: '*',
         groupByKeys: undefined,
@@ -1888,6 +1888,11 @@ const mockLibs: any = {
     prepend: (path: string) => path,
   },
   logger,
+  config: {
+    thresholdRule: {
+      groupByPageSize: 10_000,
+    },
+  },
 };
 
 const executor = createMetricThresholdExecutor(mockLibs);
diff --git a/x-pack/plugins/observability/server/lib/rules/threshold/threshold_executor.ts b/x-pack/plugins/observability/server/lib/rules/threshold/threshold_executor.ts
index 0d2ef03128077..d267bf68921ee 100644
--- a/x-pack/plugins/observability/server/lib/rules/threshold/threshold_executor.ts
+++ b/x-pack/plugins/observability/server/lib/rules/threshold/threshold_executor.ts
@@ -311,7 +311,9 @@ export const createMetricThresholdExecutor = ({
         );
 
         const evaluationValues = alertResults.reduce((acc: Array<number | null>, result) => {
-          acc.push(result[group].currentValue);
+          if (result[group]) {
+            acc.push(result[group].currentValue);
+          }
           return acc;
         }, []);