Added defaultActionMessage to index threshold alert UI type definition

x-pack/plugins/stack_alerts/server/alert_types/index_threshold/action_context.ts

@@ -27,6 +27,10 @@ export interface BaseActionContext extends AlertInstanceContext {
   date: string;
   // the value that met the threshold
   value: number;
+  // the function that is used
+  function: string;
+  // the time window for aggregation
+  window: string;
 }
 
 export function addMessages(
@@ -42,10 +46,6 @@ export function addMessages(
     },
   });
 
-  const agg = params.aggField ? `${params.aggType}(${params.aggField})` : `${params.aggType}`;
-  const humanFn = `${agg} ${params.thresholdComparator} ${params.threshold.join(',')}`;
-
-  const window = `${params.timeWindowSize}${params.timeWindowUnit}`;
   const message = i18n.translate(
     'xpack.stackAlerts.indexThreshold.alertTypeContextMessageDescription',
     {
@@ -55,8 +55,8 @@ export function addMessages(
         name: alertInfo.name,
         group: baseContext.group,
         value: baseContext.value,
-        function: humanFn,
-        window,
+        function: baseContext.function,
+        window: baseContext.window,
         date: baseContext.date,
       },
     }

x-pack/plugins/stack_alerts/server/alert_types/index_threshold/alert_type.ts

@@ -83,6 +83,20 @@ export function getAlertType(service: Service): AlertType<Params, {}, {}, Action
     }
   );
 
+  const actionVariableContextFunctionLabel = i18n.translate(
+    'xpack.stackAlerts.indexThreshold.actionVariableContextFunctionLabel',
+    {
+      defaultMessage: 'A string formatted values combining threshold comparator and threshold',
+    }
+  );
+
+  const actionVariableContextWindowLabel = i18n.translate(
+    'xpack.stackAlerts.indexThreshold.actionVariableContextWindowLabel',
+    {
+      defaultMessage: 'A string formatted values combining time window size and time window unit',
+    }
+  );
+
   const alertParamsVariables = Object.keys(CoreQueryParamsSchemaProperties).map(
     (propKey: string) => {
       return {
@@ -107,6 +121,8 @@ export function getAlertType(service: Service): AlertType<Params, {}, {}, Action
         { name: 'group', description: actionVariableContextGroupLabel },
         { name: 'date', description: actionVariableContextDateLabel },
         { name: 'value', description: actionVariableContextValueLabel },
+        { name: 'function', description: actionVariableContextFunctionLabel },
+        { name: 'window', description: actionVariableContextWindowLabel },
       ],
       params: [
         { name: 'threshold', description: actionVariableContextThresholdLabel },
@@ -160,10 +176,17 @@ export function getAlertType(service: Service): AlertType<Params, {}, {}, Action
 
       if (!met) continue;
 
+      const agg = params.aggField ? `${params.aggType}(${params.aggField})` : `${params.aggType}`;
+      const humanFn = `${agg} ${params.thresholdComparator} ${params.threshold.join(',')}`;
+
+      const window = `${params.timeWindowSize}${params.timeWindowUnit}`;
+
       const baseContext: BaseActionContext = {
         date,
         group: instanceId,
         value,
+        function: humanFn,
+        window,
       };
       const actionContext = addMessages(options, baseContext, params);
       const alertInstance = options.services.alertInstanceFactory(instanceId);

x-pack/plugins/triggers_actions_ui/public/application/components/builtin_alert_types/threshold/index.ts

@@ -4,7 +4,7 @@
  * you may not use this file except in compliance with the Elastic License.
  */
 import { lazy } from 'react';
-
+import { i18n } from '@kbn/i18n';
 import { AlertTypeModel } from '../../../../types';
 import { validateExpression } from './validation';
 import { IndexThresholdAlertParams } from './types';
@@ -17,6 +17,12 @@ export function getAlertType(): AlertTypeModel<IndexThresholdAlertParams, Alerts
     iconClass: 'alert',
     alertParamsExpression: lazy(() => import('./expression')),
     validate: validateExpression,
+    defaultActionMessage: i18n.translate(
+      'xpack.triggersActionsUI.builtin_alert_types.threshold.alertDefaultActionMessage',
+      {
+        defaultMessage: `alert \\{\\{alertName\\}\\} group \\{\\{context.group\\}\\} value \\{\\{context.value\\}\\} exceeded threshold \\{\\{context.function\\}\\} over \\{\\{context.window\\}\\} on \\{\\{context.date\\}\\}`,
+      }
+    ),
     requiresAppContext: false,
   };
 }