fix: add getSeenAppsForFeatureToggle to client-store-v2

src/lib/db/client-metrics-store-v2.ts

@@ -114,4 +114,16 @@ export class ClientMetricsStoreV2 implements IClientMetricsStoreV2 {
             .andWhereRaw(`timestamp >= NOW() - INTERVAL '${hoursBack} hours'`);
         return rows.map(fromRow);
     }
+
+    async getSeenAppsForFeatureToggle(
+        featureName: string,
+        hoursBack: number = 24,
+    ): Promise<string[]> {
+        return this.db<ClientMetricsEnvTable>(TABLE)
+            .distinct()
+            .where({ feature_name: featureName })
+            .andWhereRaw(`timestamp >= NOW() - INTERVAL '${hoursBack} hours'`)
+            .pluck('app_name')
+            .orderBy('app_name');
+    }
 }

src/lib/types/stores/client-metrics-store-v2.ts

@@ -19,4 +19,8 @@ export interface IClientMetricsStoreV2
         featureName: string,
         hoursBack?: number,
     ): Promise<IClientMetricsEnv[]>;
+    getSeenAppsForFeatureToggle(
+        featureName: string,
+        hoursBack?: number,
+    ): Promise<string[]>;
 }

src/test/e2e/stores/client-metrics-store-v2.e2e.test.ts

@@ -214,3 +214,37 @@ test('Should insert 1500 feature toggle metrics', async () => {
 
     expect(savedMetrics).toHaveLength(1500);
 });
+
+test('Should return seen applications using a feature toggle', async () => {
+    const metrics: IClientMetricsEnv[] = [
+        {
+            featureName: 'demo',
+            appName: 'web',
+            environment: 'dev',
+            timestamp: new Date(),
+            yes: 2,
+            no: 2,
+        },
+        {
+            featureName: 'demo',
+            appName: 'backend-api',
+            environment: 'dev',
+            timestamp: new Date(),
+            yes: 1,
+            no: 3,
+        },
+        {
+            featureName: 'demo',
+            appName: 'backend-api',
+            environment: 'dev',
+            timestamp: new Date(),
+            yes: 1,
+            no: 3,
+        },
+    ];
+    await clientMetricsStore.batchInsertMetrics(metrics);
+    const apps = await clientMetricsStore.getSeenAppsForFeatureToggle('demo');
+
+    expect(apps).toHaveLength(2);
+    expect(apps).toStrictEqual(['backend-api', 'web']);
+});