feat: health score backend (#8687)

Implements the backend part for project health.

---------

Co-authored-by: Thomas Heartman <thomas@getunleash.io>

src/lib/features/project-status/createProjectStatusService.ts

@@ -8,6 +8,8 @@ import FakeApiTokenStore from '../../../test/fixtures/fake-api-token-store';
 import { ApiTokenStore } from '../../db/api-token-store';
 import SegmentStore from '../segment/segment-store';
 import FakeSegmentStore from '../../../test/fixtures/fake-segment-store';
+import { PersonalDashboardReadModel } from '../personal-dashboard/personal-dashboard-read-model';
+import { FakePersonalDashboardReadModel } from '../personal-dashboard/fake-personal-dashboard-read-model';
 
 export const createProjectStatusService = (
     db: Db,
@@ -33,12 +35,15 @@ export const createProjectStatusService = (
         config.flagResolver,
     );
 
-    return new ProjectStatusService({
+    return new ProjectStatusService(
+        {
             eventStore,
             projectStore,
             apiTokenStore,
             segmentStore,
-    });
+        },
+        new PersonalDashboardReadModel(db),
+    );
 };
 
 export const createFakeProjectStatusService = () => {
@@ -46,12 +51,15 @@ export const createFakeProjectStatusService = () => {
     const projectStore = new FakeProjectStore();
     const apiTokenStore = new FakeApiTokenStore();
     const segmentStore = new FakeSegmentStore();
-    const projectStatusService = new ProjectStatusService({
+    const projectStatusService = new ProjectStatusService(
+        {
             eventStore,
             projectStore,
             apiTokenStore,
             segmentStore,
-    });
+        },
+        new FakePersonalDashboardReadModel(),
+    );
 
     return {
         projectStatusService,

src/lib/features/project-status/project-status-service.ts

@@ -6,14 +6,17 @@ import type {
     ISegmentStore,
     IUnleashStores,
 } from '../../types';
+import type { IPersonalDashboardReadModel } from '../personal-dashboard/personal-dashboard-read-model-type';
 
 export class ProjectStatusService {
     private eventStore: IEventStore;
     private projectStore: IProjectStore;
     private apiTokenStore: IApiTokenStore;
     private segmentStore: ISegmentStore;
+    private personalDashboardReadModel: IPersonalDashboardReadModel;
 
-    constructor({
+    constructor(
+        {
             eventStore,
             projectStore,
             apiTokenStore,
@@ -21,11 +24,14 @@ export class ProjectStatusService {
         }: Pick<
             IUnleashStores,
             'eventStore' | 'projectStore' | 'apiTokenStore' | 'segmentStore'
-    >) {
+        >,
+        personalDashboardReadModel: IPersonalDashboardReadModel,
+    ) {
         this.eventStore = eventStore;
         this.projectStore = projectStore;
         this.apiTokenStore = apiTokenStore;
         this.segmentStore = segmentStore;
+        this.personalDashboardReadModel = personalDashboardReadModel;
     }
 
     async getProjectStatus(projectId: string): Promise<ProjectStatusSchema> {
@@ -35,14 +41,21 @@ export class ProjectStatusService {
             apiTokens,
             segments,
             activityCountByDate,
+            healthScores,
         ] = await Promise.all([
             this.projectStore.getConnectedEnvironmentCountForProject(projectId),
             this.projectStore.getMembersCountByProject(projectId),
             this.apiTokenStore.countProjectTokens(projectId),
             this.segmentStore.getProjectSegmentCount(projectId),
             this.eventStore.getProjectRecentEventActivity(projectId),
+            this.personalDashboardReadModel.getLatestHealthScores(projectId, 4),
         ]);
 
+        const averageHealth = healthScores.length
+            ? healthScores.reduce((acc, num) => acc + num, 0) /
+              healthScores.length
+            : 0;
+
         return {
             resources: {
                 connectedEnvironments,
@@ -51,6 +64,7 @@ export class ProjectStatusService {
                 segments,
             },
             activityCountByDate,
+            averageHealth,
         };
     }
 }

src/lib/features/project-status/projects-status.e2e.test.ts

@@ -23,6 +23,20 @@ let eventService: EventService;
 const TEST_USER_ID = -9999;
 const config: IUnleashConfig = createTestConfig();
 
+const insertHealthScore = (id: string, health: number) => {
+    const irrelevantFlagTrendDetails = {
+        total_flags: 10,
+        stale_flags: 10,
+        potentially_stale_flags: 10,
+    };
+    return db.rawDatabase('flag_trends').insert({
+        ...irrelevantFlagTrendDetails,
+        id,
+        project: 'default',
+        health,
+    });
+};
+
 const getCurrentDateStrings = () => {
     const today = new Date();
     const todayString = today.toISOString().split('T')[0];
@@ -226,3 +240,19 @@ test('project resources should contain the right data', async () => {
         connectedEnvironments: 1,
     });
 });
+
+test('project health should be correct average', async () => {
+    await insertHealthScore('2024-04', 100);
+
+    await insertHealthScore('2024-05', 0);
+    await insertHealthScore('2024-06', 0);
+    await insertHealthScore('2024-07', 90);
+    await insertHealthScore('2024-08', 70);
+
+    const { body } = await app.request
+        .get('/api/admin/projects/default/status')
+        .expect('Content-Type', /json/)
+        .expect(200);
+
+    expect(body.averageHealth).toBe(40);
+});

src/lib/openapi/spec/project-status-schema.test.ts

@@ -3,6 +3,7 @@ import type { ProjectStatusSchema } from './project-status-schema';
 
 test('projectStatusSchema', () => {
     const data: ProjectStatusSchema = {
+        averageHealth: 50,
         activityCountByDate: [
             { date: '2022-12-14', count: 2 },
             { date: '2022-12-15', count: 5 },

src/lib/openapi/spec/project-status-schema.ts

@@ -5,7 +5,7 @@ export const projectStatusSchema = {
     $id: '#/components/schemas/projectStatusSchema',
     type: 'object',
     additionalProperties: false,
-    required: ['activityCountByDate', 'resources'],
+    required: ['activityCountByDate', 'resources', 'averageHealth'],
     description:
         'Schema representing the overall status of a project, including an array of activity records. Each record in the activity array contains a date and a count, providing a snapshot of the project’s activity level over time.',
     properties: {
@@ -14,6 +14,12 @@ export const projectStatusSchema = {
             description:
                 'Array of activity records with date and count, representing the project’s daily activity statistics.',
         },
+        averageHealth: {
+            type: 'integer',
+            minimum: 0,
+            description:
+                'The average health score over the last 4 weeks, indicating whether features are stale or active.',
+        },
         resources: {
             type: 'object',
             additionalProperties: false,