feat: add remaining resource usage to instance stats (#7958)

Updates the instance stats endpoint with 
- maxEnvironmentStrategies
- maxConstraints
- maxConstraintValues

It adds the following rows to the front end table:
- segments (already in the payload, just not used for the table before)
- API tokens (separate rows for type, + one for total) (also existed
before, but wasn't listed)
- Highest number of strategies used for a single flag in a single
environment
- Highest number of constraints used on a single strategy
- Highest number of values used for a single constraint


![image](https://github.com/user-attachments/assets/57798f8e-c466-4590-820b-15afd3729243)

frontend/src/component/admin/instance-admin/InstanceStats/InstanceStats.tsx

@@ -8,13 +8,13 @@ import {
     TableRow,
 } from '@mui/material';
 import { Box } from '@mui/system';
-import type { VFC } from 'react';
+import type { FC } from 'react';
 import { useInstanceStats } from 'hooks/api/getters/useInstanceStats/useInstanceStats';
 import { formatApiPath } from '../../../../utils/formatPath';
 import { PageContent } from '../../../common/PageContent/PageContent';
 import { PageHeader } from '../../../common/PageHeader/PageHeader';
 
-export const InstanceStats: VFC = () => {
+export const InstanceStats: FC = () => {
     const { stats } = useInstanceStats();
 
     let versionTitle: string;
@@ -28,6 +28,11 @@ export const InstanceStats: VFC = () => {
         version = stats?.versionOSS;
     }
 
+    const apiTokensTotal = Object.values(stats?.apiTokens ?? {}).reduce(
+        (acc, val) => acc + val,
+        0,
+    );
+
     const rows = [
         { title: 'Instance Id', value: stats?.instanceId, offset: false },
         { title: versionTitle, value: version },
@@ -41,6 +46,23 @@ export const InstanceStats: VFC = () => {
         { title: 'Strategies', value: stats?.strategies },
         { title: 'Feature exports', value: stats?.featureExports },
         { title: 'Feature imports', value: stats?.featureImports },
+        { title: 'Admin API tokens', value: stats?.apiTokens?.admin },
+        { title: 'Client API tokens', value: stats?.apiTokens?.client },
+        { title: 'Frontend API tokens', value: stats?.apiTokens?.frontend },
+        { title: 'API tokens total', value: apiTokensTotal },
+        { title: 'Segments', value: stats?.segments },
+        {
+            title: 'Highest number of strategies used for a single flag in a single environment',
+            value: stats?.maxEnvironmentStrategies,
+        },
+        {
+            title: 'Highest number of constraints used on a single strategy',
+            value: stats?.maxConstraints,
+        },
+        {
+            title: 'Highest number of values used for a single constraint',
+            value: stats?.maxConstraintValues,
+        },
     ];
 
     if (stats?.versionEnterprise) {

frontend/src/openapi/models/instanceAdminStatsSchema.ts

@@ -92,4 +92,20 @@ export interface InstanceAdminStatsSchema {
     versionEnterprise?: string;
     /** The version of Unleash OSS that is bundled in this instance */
     versionOSS?: string;
+
+    /** A breakdown of API tokens that exist in this instance */
+    apiTokens: {
+        client: number;
+        admin: number;
+        frontend: number;
+    };
+
+    // The highest number of strategies used on a single feature flag in a single environment.
+    maxEnvironmentStrategies: number;
+
+    // The highest number of constraints used on a single strategy.
+    maxConstraints: number;
+
+    // The highest number of constraint values used on a single constraint.
+    maxConstraintValues: number;
 }

src/lib/features/instance-stats/createInstanceStatsService.ts

@@ -40,6 +40,8 @@ import FakeSettingStore from '../../../test/fixtures/fake-setting-store';
 import FakeSegmentStore from '../../../test/fixtures/fake-segment-store';
 import FakeStrategiesStore from '../../../test/fixtures/fake-strategies-store';
 import FakeFeatureStrategiesStore from '../feature-toggle/fakes/fake-feature-strategies-store';
+import { FeatureStrategiesReadModel } from '../feature-toggle/feature-strategies-read-model';
+import { FakeFeatureStrategiesReadModel } from '../feature-toggle/fake-feature-strategies-read-model';
 
 export const createInstanceStatsService = (db: Db, config: IUnleashConfig) => {
     const { eventBus, getLogger, flagResolver } = config;
@@ -89,6 +91,8 @@ export const createInstanceStatsService = (db: Db, config: IUnleashConfig) => {
         getLogger,
         flagResolver,
     );
+
+    const featureStrategiesReadModel = new FeatureStrategiesReadModel(db);
     const instanceStatsServiceStores = {
         featureToggleStore,
         userStore,
@@ -104,6 +108,7 @@ export const createInstanceStatsService = (db: Db, config: IUnleashConfig) => {
         eventStore,
         apiTokenStore,
         clientMetricsStoreV2,
+        featureStrategiesReadModel,
     };
     const featureStrategiesStore = new FeatureStrategyStore(
         db,
@@ -151,6 +156,7 @@ export const createFakeInstanceStatsService = (config: IUnleashConfig) => {
     const eventStore = new FakeEventStore();
     const apiTokenStore = new FakeApiTokenStore();
     const clientMetricsStoreV2 = new FakeClientMetricsStoreV2();
+    const featureStrategiesReadModel = new FakeFeatureStrategiesReadModel();
 
     const instanceStatsServiceStores = {
         featureToggleStore,
@@ -167,6 +173,7 @@ export const createFakeInstanceStatsService = (config: IUnleashConfig) => {
         eventStore,
         apiTokenStore,
         clientMetricsStoreV2,
+        featureStrategiesReadModel,
     };
     const featureStrategiesStore = new FakeFeatureStrategiesStore();
     const versionServiceStores = {

src/lib/features/instance-stats/instance-stats-service.ts

@@ -5,6 +5,7 @@ import type {
     IClientInstanceStore,
     IClientMetricsStoreV2,
     IEventStore,
+    IFeatureStrategiesReadModel,
     IUnleashStores,
 } from '../../types/stores';
 import type { IContextFieldStore } from '../../types/stores/context-field-store';
@@ -61,6 +62,9 @@ export interface InstanceStats {
         enabledCount: number;
         variantCount: number;
     };
+    maxEnvironmentStrategies: number;
+    maxConstraints: number;
+    maxConstraintValues: number;
 }
 
 export type InstanceStatsSigned = Omit<InstanceStats, 'projects'> & {
@@ -109,6 +113,8 @@ export class InstanceStatsService {
 
     private getProductionChanges: GetProductionChanges;
 
+    private featureStrategiesReadModel: IFeatureStrategiesReadModel;
+
     constructor(
         {
             featureToggleStore,
@@ -125,6 +131,7 @@ export class InstanceStatsService {
             eventStore,
             apiTokenStore,
             clientMetricsStoreV2,
+            featureStrategiesReadModel,
         }: Pick<
             IUnleashStores,
             | 'featureToggleStore'
@@ -141,6 +148,7 @@ export class InstanceStatsService {
             | 'eventStore'
             | 'apiTokenStore'
             | 'clientMetricsStoreV2'
+            | 'featureStrategiesReadModel'
         >,
         {
             getLogger,
@@ -169,6 +177,7 @@ export class InstanceStatsService {
         this.apiTokenStore = apiTokenStore;
         this.clientMetricsStore = clientMetricsStoreV2;
         this.flagResolver = flagResolver;
+        this.featureStrategiesReadModel = featureStrategiesReadModel;
     }
 
     async refreshAppCountSnapshot(): Promise<
@@ -250,6 +259,9 @@ export class InstanceStatsService {
             featureImports,
             productionChanges,
             previousDayMetricsBucketsCount,
+            maxEnvironmentStrategies,
+            maxConstraintValues,
+            maxConstraints,
         ] = await Promise.all([
             this.getToggleCount(),
             this.getArchivedToggleCount(),
@@ -277,6 +289,9 @@ export class InstanceStatsService {
             }),
             this.getProductionChanges(),
             this.clientMetricsStore.countPreviousDayHourlyMetricsBuckets(),
+            this.featureStrategiesReadModel.getMaxFeatureEnvironmentStrategies(),
+            this.featureStrategiesReadModel.getMaxConstraintValues(),
+            this.featureStrategiesReadModel.getMaxConstraintsPerStrategy(),
         ]);
 
         return {
@@ -309,6 +324,9 @@ export class InstanceStatsService {
             featureImports,
             productionChanges,
             previousDayMetricsBucketsCount,
+            maxEnvironmentStrategies: maxEnvironmentStrategies?.count ?? 0,
+            maxConstraintValues: maxConstraintValues?.count ?? 0,
+            maxConstraints: maxConstraints?.count ?? 0,
         };
     }