diff --git a/x-pack/plugins/monitoring/server/alerts/base_alert.ts b/x-pack/plugins/monitoring/server/alerts/base_alert.ts
index 016acf2737f9b..f583b4882f83c 100644
--- a/x-pack/plugins/monitoring/server/alerts/base_alert.ts
+++ b/x-pack/plugins/monitoring/server/alerts/base_alert.ts
@@ -9,6 +9,7 @@ import {
   ILegacyCustomClusterClient,
   Logger,
   IUiSettingsClient,
+  LegacyCallAPIOptions,
 } from 'kibana/server';
 import { i18n } from '@kbn/i18n';
 import {
@@ -36,6 +37,8 @@ import { MonitoringConfig } from '../config';
 import { AlertSeverity } from '../../common/enums';
 import { CommonAlertFilter, CommonAlertParams, CommonBaseAlert } from '../../common/types';
 import { MonitoringLicenseService } from '../types';
+import { mbSafeQuery } from '../lib/mb_safe_query';
+import { appendMetricbeatIndex } from '../lib/alerts/append_mb_index';
 
 export class BaseAlert {
   public type!: string;
@@ -212,13 +215,20 @@ export class BaseAlert {
       `Executing alert with params: ${JSON.stringify(params)} and state: ${JSON.stringify(state)}`
     );
 
-    const callCluster = this.monitoringCluster
+    const _callCluster = this.monitoringCluster
       ? this.monitoringCluster.callAsInternalUser
       : services.callCluster;
+    const callCluster = async (
+      endpoint: string,
+      clientParams?: Record<string, unknown>,
+      options?: LegacyCallAPIOptions
+    ) => {
+      return await mbSafeQuery(async () => _callCluster(endpoint, clientParams, options));
+    };
     const availableCcs = this.config.ui.ccs.enabled ? await fetchAvailableCcs(callCluster) : [];
     // Support CCS use cases by querying to find available remote clusters
     // and then adding those to the index pattern we are searching against
-    let esIndexPattern = INDEX_PATTERN_ELASTICSEARCH;
+    let esIndexPattern = appendMetricbeatIndex(this.config, INDEX_PATTERN_ELASTICSEARCH);
     if (availableCcs) {
       esIndexPattern = getCcsIndexPattern(esIndexPattern, availableCcs);
     }
diff --git a/x-pack/plugins/monitoring/server/alerts/cluster_health_alert.test.ts b/x-pack/plugins/monitoring/server/alerts/cluster_health_alert.test.ts
index 4b083787f58cb..66085b53516a2 100644
--- a/x-pack/plugins/monitoring/server/alerts/cluster_health_alert.test.ts
+++ b/x-pack/plugins/monitoring/server/alerts/cluster_health_alert.test.ts
@@ -66,7 +66,11 @@ describe('ClusterHealthAlert', () => {
     });
     const monitoringCluster = null;
     const config = {
-      ui: { ccs: { enabled: true }, container: { elasticsearch: { enabled: false } } },
+      ui: {
+        ccs: { enabled: true },
+        container: { elasticsearch: { enabled: false } },
+        metricbeat: { index: 'metricbeat-*' },
+      },
     };
     const kibanaUrl = 'http://localhost:5601';
 
diff --git a/x-pack/plugins/monitoring/server/alerts/cpu_usage_alert.test.ts b/x-pack/plugins/monitoring/server/alerts/cpu_usage_alert.test.ts
index c330e977e53d8..2705a77e0fce4 100644
--- a/x-pack/plugins/monitoring/server/alerts/cpu_usage_alert.test.ts
+++ b/x-pack/plugins/monitoring/server/alerts/cpu_usage_alert.test.ts
@@ -70,7 +70,11 @@ describe('CpuUsageAlert', () => {
     });
     const monitoringCluster = null;
     const config = {
-      ui: { ccs: { enabled: true }, container: { elasticsearch: { enabled: false } } },
+      ui: {
+        ccs: { enabled: true },
+        container: { elasticsearch: { enabled: false } },
+        metricbeat: { index: 'metricbeat-*' },
+      },
     };
     const kibanaUrl = 'http://localhost:5601';
 
diff --git a/x-pack/plugins/monitoring/server/alerts/cpu_usage_alert.ts b/x-pack/plugins/monitoring/server/alerts/cpu_usage_alert.ts
index afe5abcf1ebd7..5bca84e33da3c 100644
--- a/x-pack/plugins/monitoring/server/alerts/cpu_usage_alert.ts
+++ b/x-pack/plugins/monitoring/server/alerts/cpu_usage_alert.ts
@@ -31,6 +31,7 @@ import {
   CommonAlertParams,
   CommonAlertParamDetail,
 } from '../../common/types';
+import { appendMetricbeatIndex } from '../lib/alerts/append_mb_index';
 
 const RESOLVED = i18n.translate('xpack.monitoring.alerts.cpuUsage.resolved', {
   defaultMessage: 'resolved',
@@ -137,7 +138,7 @@ export class CpuUsageAlert extends BaseAlert {
     uiSettings: IUiSettingsClient,
     availableCcs: string[]
   ): Promise<AlertData[]> {
-    let esIndexPattern = INDEX_PATTERN_ELASTICSEARCH;
+    let esIndexPattern = appendMetricbeatIndex(this.config, INDEX_PATTERN_ELASTICSEARCH);
     if (availableCcs) {
       esIndexPattern = getCcsIndexPattern(esIndexPattern, availableCcs);
     }
diff --git a/x-pack/plugins/monitoring/server/alerts/elasticsearch_version_mismatch_alert.test.ts b/x-pack/plugins/monitoring/server/alerts/elasticsearch_version_mismatch_alert.test.ts
index ed300c211215b..1db85f915d794 100644
--- a/x-pack/plugins/monitoring/server/alerts/elasticsearch_version_mismatch_alert.test.ts
+++ b/x-pack/plugins/monitoring/server/alerts/elasticsearch_version_mismatch_alert.test.ts
@@ -69,7 +69,11 @@ describe('ElasticsearchVersionMismatchAlert', () => {
     });
     const monitoringCluster = null;
     const config = {
-      ui: { ccs: { enabled: true }, container: { elasticsearch: { enabled: false } } },
+      ui: {
+        ccs: { enabled: true },
+        container: { elasticsearch: { enabled: false } },
+        metricbeat: { index: 'metricbeat-*' },
+      },
     };
     const kibanaUrl = 'http://localhost:5601';
 
diff --git a/x-pack/plugins/monitoring/server/alerts/kibana_version_mismatch_alert.test.ts b/x-pack/plugins/monitoring/server/alerts/kibana_version_mismatch_alert.test.ts
index dd3b37b5755e7..362532a995f2d 100644
--- a/x-pack/plugins/monitoring/server/alerts/kibana_version_mismatch_alert.test.ts
+++ b/x-pack/plugins/monitoring/server/alerts/kibana_version_mismatch_alert.test.ts
@@ -72,7 +72,11 @@ describe('KibanaVersionMismatchAlert', () => {
     });
     const monitoringCluster = null;
     const config = {
-      ui: { ccs: { enabled: true }, container: { elasticsearch: { enabled: false } } },
+      ui: {
+        ccs: { enabled: true },
+        container: { elasticsearch: { enabled: false } },
+        metricbeat: { index: 'metricbeat-*' },
+      },
     };
     const kibanaUrl = 'http://localhost:5601';
 
diff --git a/x-pack/plugins/monitoring/server/alerts/license_expiration_alert.test.ts b/x-pack/plugins/monitoring/server/alerts/license_expiration_alert.test.ts
index e2f21b34efe21..da94e4af83802 100644
--- a/x-pack/plugins/monitoring/server/alerts/license_expiration_alert.test.ts
+++ b/x-pack/plugins/monitoring/server/alerts/license_expiration_alert.test.ts
@@ -76,7 +76,11 @@ describe('LicenseExpirationAlert', () => {
     });
     const monitoringCluster = null;
     const config = {
-      ui: { ccs: { enabled: true }, container: { elasticsearch: { enabled: false } } },
+      ui: {
+        ccs: { enabled: true },
+        container: { elasticsearch: { enabled: false } },
+        metricbeat: { index: 'metricbeat-*' },
+      },
     };
     const kibanaUrl = 'http://localhost:5601';
 
diff --git a/x-pack/plugins/monitoring/server/alerts/logstash_version_mismatch_alert.test.ts b/x-pack/plugins/monitoring/server/alerts/logstash_version_mismatch_alert.test.ts
index fbb4a01d5b4ed..5ed189014cc6e 100644
--- a/x-pack/plugins/monitoring/server/alerts/logstash_version_mismatch_alert.test.ts
+++ b/x-pack/plugins/monitoring/server/alerts/logstash_version_mismatch_alert.test.ts
@@ -69,7 +69,11 @@ describe('LogstashVersionMismatchAlert', () => {
     });
     const monitoringCluster = null;
     const config = {
-      ui: { ccs: { enabled: true }, container: { elasticsearch: { enabled: false } } },
+      ui: {
+        ccs: { enabled: true },
+        container: { elasticsearch: { enabled: false } },
+        metricbeat: { index: 'metricbeat-*' },
+      },
     };
     const kibanaUrl = 'http://localhost:5601';
 
diff --git a/x-pack/plugins/monitoring/server/alerts/nodes_changed_alert.test.ts b/x-pack/plugins/monitoring/server/alerts/nodes_changed_alert.test.ts
index 4b3e3d2d6cb6d..ec2b19eb5dfae 100644
--- a/x-pack/plugins/monitoring/server/alerts/nodes_changed_alert.test.ts
+++ b/x-pack/plugins/monitoring/server/alerts/nodes_changed_alert.test.ts
@@ -82,7 +82,11 @@ describe('NodesChangedAlert', () => {
     });
     const monitoringCluster = null;
     const config = {
-      ui: { ccs: { enabled: true }, container: { elasticsearch: { enabled: false } } },
+      ui: {
+        ccs: { enabled: true },
+        container: { elasticsearch: { enabled: false } },
+        metricbeat: { index: 'metricbeat-*' },
+      },
     };
     const kibanaUrl = 'http://localhost:5601';
 
diff --git a/x-pack/plugins/monitoring/server/lib/alerts/append_mb_index.ts b/x-pack/plugins/monitoring/server/lib/alerts/append_mb_index.ts
new file mode 100644
index 0000000000000..683a0dfeccb1f
--- /dev/null
+++ b/x-pack/plugins/monitoring/server/lib/alerts/append_mb_index.ts
@@ -0,0 +1,11 @@
+/*
+ * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
+ * or more contributor license agreements. Licensed under the Elastic License;
+ * you may not use this file except in compliance with the Elastic License.
+ */
+
+import { MonitoringConfig } from '../../config';
+
+export function appendMetricbeatIndex(config: MonitoringConfig, indexPattern: string) {
+  return `${indexPattern},${config.ui.metricbeat.index}`;
+}
diff --git a/x-pack/plugins/monitoring/server/lib/alerts/get_ccs_index_pattern.ts b/x-pack/plugins/monitoring/server/lib/alerts/get_ccs_index_pattern.ts
index 7fdbc79685f7c..1907d2b4b3401 100644
--- a/x-pack/plugins/monitoring/server/lib/alerts/get_ccs_index_pattern.ts
+++ b/x-pack/plugins/monitoring/server/lib/alerts/get_ccs_index_pattern.ts
@@ -4,10 +4,11 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 export function getCcsIndexPattern(indexPattern: string, remotes: string[]): string {
-  return `${indexPattern},${indexPattern
-    .split(',')
-    .map((pattern) => {
-      return remotes.map((remoteName) => `${remoteName}:${pattern}`).join(',');
-    })
-    .join(',')}`;
+  const patternsToAdd = [];
+  for (const index of indexPattern.split(',')) {
+    for (const remote of remotes) {
+      patternsToAdd.push(`${remote}:${index}`);
+    }
+  }
+  return [...indexPattern.split(','), ...patternsToAdd].join(',');
 }
diff --git a/x-pack/plugins/monitoring/server/lib/ccs_utils.js b/x-pack/plugins/monitoring/server/lib/ccs_utils.js
index bef07124fb430..96910dd86a94d 100644
--- a/x-pack/plugins/monitoring/server/lib/ccs_utils.js
+++ b/x-pack/plugins/monitoring/server/lib/ccs_utils.js
@@ -13,7 +13,7 @@ export function appendMetricbeatIndex(config, indexPattern) {
   if (isFunction(config.get)) {
     mbIndex = config.get('monitoring.ui.metricbeat.index');
   } else {
-    mbIndex = get(config, 'monitoring.ui.metricbeat.index');
+    mbIndex = get(config, 'ui.metricbeat.index');
   }
 
   const newIndexPattern = `${indexPattern},${mbIndex}`;