[APM] Collect total number of service groups (#142768)

* [APM] Collect the total number of service groups

* Add unit tests

* Update telemetry mapping

* [CI] Auto-commit changed files from 'node scripts/eslint --no-cache --fix'

* update snapshots

Co-authored-by: kibanamachine <42973632+kibanamachine@users.noreply.github.com>

x-pack/plugins/apm/common/__snapshots__/apm_telemetry.test.ts.snap

@@ -1075,6 +1075,9 @@ exports[`APM telemetry helpers getApmTelemetry generates a JSON object with the
                       "properties": {
                         "kuery_fields": {
                           "type": "keyword"
+                        },
+                        "total": {
+                          "type": "long"
                         }
                       }
                     },

x-pack/plugins/apm/server/lib/apm_telemetry/collect_data_telemetry/tasks.test.ts

@@ -5,6 +5,7 @@
  * 2.0.
  */
 
+import { savedObjectsClientMock } from '@kbn/core-saved-objects-api-server-mocks';
 import { ApmIndicesConfig } from '../../../routes/settings/apm_indices/get_apm_indices';
 import { tasks } from './tasks';
 import {
@@ -444,4 +445,49 @@ describe('data telemetry collection tasks', () => {
       });
     });
   });
+
+  describe('service groups', () => {
+    const task = tasks.find((t) => t.name === 'service_groups');
+    const savedObjectsClient = savedObjectsClientMock.create();
+
+    savedObjectsClient.find.mockResolvedValue({
+      page: 1,
+      per_page: 500,
+      total: 2,
+      saved_objects: [
+        {
+          type: 'apm-service-group',
+          id: '0b6157f0-44bd-11ed-bdb7-bffab551cd4d',
+          namespaces: ['default'],
+          attributes: {
+            color: '#5094C4',
+            kuery: 'service.environment: production',
+            groupName: 'production',
+          },
+          references: [],
+          score: 1,
+        },
+        {
+          type: 'apm-service-group',
+          id: '0b6157f0-44bd-11ed-bdb7-bffab551cd4d',
+          namespaces: ['default'],
+          attributes: {
+            color: '#5094C4',
+            kuery: 'agent.name: go',
+            groupName: 'agent',
+          },
+          references: [],
+          score: 0,
+        },
+      ],
+    });
+    it('returns service group stats', async () => {
+      expect(await task?.executor({ savedObjectsClient } as any)).toEqual({
+        service_groups: {
+          kuery_fields: ['service.environment', 'agent.name'],
+          total: 2,
+        },
+      });
+    });
+  });
 });

x-pack/plugins/apm/server/lib/apm_telemetry/collect_data_telemetry/tasks.ts

@@ -15,6 +15,7 @@ import { AGENT_NAMES, RUM_AGENT_NAMES } from '../../../../common/agent_name';
 import {
   SavedServiceGroup,
   APM_SERVICE_GROUP_SAVED_OBJECT_TYPE,
+  MAX_NUMBER_OF_SERVICE_GROUPS,
 } from '../../../../common/service_groups';
 import { getKueryFields } from '../../helpers/get_kuery_fields';
 import {
@@ -1134,7 +1135,7 @@ export const tasks: TelemetryTask[] = [
       const response = await savedObjectsClient.find<SavedServiceGroup>({
         type: APM_SERVICE_GROUP_SAVED_OBJECT_TYPE,
         page: 1,
-        perPage: 50,
+        perPage: MAX_NUMBER_OF_SERVICE_GROUPS,
         sortField: 'updated_at',
         sortOrder: 'desc',
       });
@@ -1148,6 +1149,7 @@ export const tasks: TelemetryTask[] = [
       return {
         service_groups: {
           kuery_fields: kueryFields,
+          total: response.total ?? 0,
         },
       };
     },

x-pack/plugins/apm/server/lib/apm_telemetry/schema.ts

@@ -235,6 +235,7 @@ export const apmSchema: MakeSchemaFrom<APMUsage> = {
   },
   service_groups: {
     kuery_fields: { type: 'array', items: { type: 'keyword' } },
+    total: long,
   },
   per_service: { type: 'array', items: { ...apmPerServiceSchema } },
   tasks: {

x-pack/plugins/apm/server/lib/apm_telemetry/types.ts

@@ -173,6 +173,7 @@ export interface APMUsage {
   };
   service_groups: {
     kuery_fields: string[];
+    total: number;
   };
   per_service: APMPerService[];
   tasks: Record<

x-pack/plugins/telemetry_collection_xpack/schema/xpack_plugins.json

@@ -4109,6 +4109,9 @@
               "items": {
                 "type": "keyword"
               }
+            },
+            "total": {
+              "type": "long"
             }
           }
         },