[Synthetics] adjust monitor status rule location logic (#156432)

## Summary

Resolves https://github.com/elastic/kibana/issues/156223

In previous stack versions, the label was not saved to the saved object.

This ensures that alerting works both for those early versions as well
current versions, by adjusting the logic to consider both the
location.label and location.id in alerting logic.

### Testing

1. Create a new oblt-cli cluster and connect to the synthetics service,
locally or via the dev environment
2. Checkout v8.5.3
3. Create a monitor. Make sure it's down and wait for the first down
check
4. Check out this branch
5. Navigate to Observabillity alerts. Ensure that an alert is generated
for the monitor. You may have to wait a few minutes.

---------

Co-authored-by: Shahzad <shahzad31comp@gmail.com>

x-pack/plugins/synthetics/server/alert_rules/status_rule/status_rule_executor.test.ts

@@ -4,22 +4,37 @@
  * 2.0; you may not use this file except in compliance with the Elastic License
  * 2.0.
  */
-
-import { StatusRuleExecutor } from './status_rule_executor';
+import moment from 'moment';
 import { loggerMock } from '@kbn/logging-mocks';
 import { savedObjectsClientMock } from '@kbn/core-saved-objects-api-server-mocks';
+import { StatusRuleExecutor } from './status_rule_executor';
 import { UptimeServerSetup } from '../../legacy_uptime/lib/adapters';
 import { mockEncryptedSO } from '../../synthetics_service/utils/mocks';
 import { elasticsearchClientMock } from '@kbn/core-elasticsearch-client-server-mocks';
 import { SyntheticsMonitorClient } from '../../synthetics_service/synthetics_monitor/synthetics_monitor_client';
 import { SyntheticsService } from '../../synthetics_service/synthetics_service';
-import moment from 'moment';
 import * as monitorUtils from '../../saved_objects/synthetics_monitor/get_all_monitors';
+import * as locationsUtils from '../../synthetics_service/get_all_locations';
+import type { PublicLocation } from '../../../common/runtime_types';
 
 describe('StatusRuleExecutor', () => {
   const mockEsClient = elasticsearchClientMock.createElasticsearchClient();
   const logger = loggerMock.create();
   const soClient = savedObjectsClientMock.create();
+  jest.spyOn(locationsUtils, 'getAllLocations').mockResolvedValue({
+    // @ts-ignore
+    publicLocations: [
+      {
+        id: 'us_central_qa',
+        label: 'US Central QA',
+      },
+      {
+        id: 'us_central_dev',
+        label: 'US Central DEV',
+      },
+    ] as unknown as PublicLocation,
+    privateLocations: [],
+  });
 
   const serverMock: UptimeServerSetup = {
     logger,
@@ -64,6 +79,7 @@ describe('StatusRuleExecutor', () => {
       soClient,
     });
   });
+
   it('marks deleted configs as expected', async () => {
     jest.spyOn(monitorUtils, 'getAllMonitors').mockResolvedValue(testMonitors);
     const statusRule = new StatusRuleExecutor(
@@ -127,6 +143,84 @@ describe('StatusRuleExecutor', () => {
       },
     });
   });
+
+  it('does not mark deleted config when monitor does not contain location label', async () => {
+    jest.spyOn(monitorUtils, 'getAllMonitors').mockResolvedValue([
+      {
+        ...testMonitors[0],
+        attributes: {
+          ...testMonitors[0].attributes,
+          locations: [
+            {
+              geo: { lon: -95.86, lat: 41.25 },
+              isServiceManaged: true,
+              id: 'us_central_qa',
+            },
+          ],
+        },
+      },
+    ]);
+    const statusRule = new StatusRuleExecutor(
+      moment().toDate(),
+      {},
+      soClient,
+      mockEsClient,
+      serverMock,
+      monitorClient
+    );
+
+    const { downConfigs } = await statusRule.getDownChecks({});
+
+    expect(downConfigs).toEqual({});
+
+    const staleDownConfigs = await statusRule.markDeletedConfigs({
+      id1: {
+        location: 'us-east-1',
+        configId: 'id1',
+        status: 'down',
+        timestamp: '2021-06-01T00:00:00.000Z',
+        monitorQueryId: 'test',
+        ping: {} as any,
+      },
+      '2548dab3-4752-4b4d-89a2-ae3402b6fb04-us_central_dev': {
+        location: 'US Central DEV',
+        configId: '2548dab3-4752-4b4d-89a2-ae3402b6fb04',
+        status: 'down',
+        timestamp: '2021-06-01T00:00:00.000Z',
+        monitorQueryId: 'test',
+        ping: {} as any,
+      },
+      '2548dab3-4752-4b4d-89a2-ae3402b6fb04-us_central_qa': {
+        location: 'US Central QA',
+        configId: '2548dab3-4752-4b4d-89a2-ae3402b6fb04',
+        status: 'down',
+        timestamp: '2021-06-01T00:00:00.000Z',
+        monitorQueryId: 'test',
+        ping: {} as any,
+      },
+    });
+
+    expect(staleDownConfigs).toEqual({
+      id1: {
+        configId: 'id1',
+        isDeleted: true,
+        location: 'us-east-1',
+        monitorQueryId: 'test',
+        ping: {},
+        status: 'down',
+        timestamp: '2021-06-01T00:00:00.000Z',
+      },
+      '2548dab3-4752-4b4d-89a2-ae3402b6fb04-us_central_dev': {
+        configId: '2548dab3-4752-4b4d-89a2-ae3402b6fb04',
+        isLocationRemoved: true,
+        location: 'US Central DEV',
+        monitorQueryId: 'test',
+        ping: {},
+        status: 'down',
+        timestamp: '2021-06-01T00:00:00.000Z',
+      },
+    });
+  });
 });
 
 const testMonitors = [

x-pack/plugins/synthetics/server/alert_rules/status_rule/status_rule_executor.ts

@@ -195,7 +195,10 @@ export class StatusRuleExecutor {
         delete downConfigs[locPlusId];
       } else {
         const { locations } = monitor.attributes;
-        if (!locations.some((l) => l.label === downConfig.location)) {
+        const isLocationRemoved = !locations.some(
+          (l) => l.id === this.getLocationId(downConfig.location)
+        );
+        if (isLocationRemoved) {
           staleDownConfigs[locPlusId] = { ...downConfig, isLocationRemoved: true };
           delete downConfigs[locPlusId];
         }