diff --git a/frontend/src/component/application/ApplicationEdit/ApplicationEdit.tsx b/frontend/src/component/application/ApplicationEdit/ApplicationEdit.tsx
index ead182bb86..56a675c5e7 100644
--- a/frontend/src/component/application/ApplicationEdit/ApplicationEdit.tsx
+++ b/frontend/src/component/application/ApplicationEdit/ApplicationEdit.tsx
@@ -14,7 +14,6 @@ import {
 import { Link as LinkIcon } from '@mui/icons-material';
 import { ConditionallyRender } from 'component/common/ConditionallyRender/ConditionallyRender';
 import { UPDATE_APPLICATION } from 'component/providers/AccessProvider/permissions';
-import { ApplicationOverview } from '../ApplicationOverview';
 import { ApplicationUpdate } from '../ApplicationUpdate/ApplicationUpdate';
 import { Dialogue } from 'component/common/Dialogue/Dialogue';
 import { PageContent } from 'component/common/PageContent/PageContent';
diff --git a/src/lib/openapi/index.ts b/src/lib/openapi/index.ts
index fa12f347bc..753764e285 100644
--- a/src/lib/openapi/index.ts
+++ b/src/lib/openapi/index.ts
@@ -198,6 +198,8 @@ import { projectApplicationsSchema } from './spec/project-applications-schema';
 import { projectApplicationSchema } from './spec/project-application-schema';
 import { projectApplicationSdkSchema } from './spec/project-application-sdk-schema';
 import { rolesSchema } from './spec/roles-schema';
+import { applicationOverviewSchema } from './spec/application-overview-schema';
+import { applicationOverviewEnvironmentSchema } from './spec/application-overview-environment-schema';
 
 // Schemas must have an $id property on the form "#/components/schemas/mySchema".
 export type SchemaId = (typeof schemas)[keyof typeof schemas]['$id'];
@@ -245,6 +247,8 @@ export const schemas: UnleashSchemas = {
     apiTokenSchema,
     apiTokensSchema,
     applicationSchema,
+    applicationOverviewSchema,
+    applicationOverviewEnvironmentSchema,
     applicationUsageSchema,
     applicationsSchema,
     batchFeaturesSchema,
diff --git a/src/lib/openapi/spec/application-overview-environment-schema.ts b/src/lib/openapi/spec/application-overview-environment-schema.ts
new file mode 100644
index 0000000000..037b01d364
--- /dev/null
+++ b/src/lib/openapi/spec/application-overview-environment-schema.ts
@@ -0,0 +1,41 @@
+import { FromSchema } from 'json-schema-to-ts';
+
+export const applicationOverviewEnvironmentSchema = {
+    $id: '#/components/schemas/applicationOverviewEnvironmentSchema',
+    type: 'object',
+    description: 'Data about an application environment',
+    additionalProperties: false,
+    required: ['name', 'instanceCount', 'sdks', 'lastSeen'],
+    properties: {
+        name: {
+            description: 'Name of the application environment',
+            type: 'string',
+            example: 'production',
+        },
+        instanceCount: {
+            description:
+                'The number of instances of the application environment',
+            type: 'number',
+            example: 5,
+        },
+        sdks: {
+            description: 'SDKs used in the application environment',
+            type: 'array',
+            items: {
+                type: 'string',
+            },
+            example: ['unleash-client-node:5.4.0', 'unleash-client-node:5.3.0'],
+        },
+        lastSeen: {
+            type: 'string',
+            format: 'date-time',
+            example: '2023-04-19T08:15:14.000Z',
+            description: 'The last time the application environment was seen',
+        },
+    },
+    components: {},
+} as const;
+
+export type ApplicationOverviewEnvironmentSchema = FromSchema<
+    typeof applicationOverviewEnvironmentSchema
+>;
diff --git a/src/lib/openapi/spec/application-overview-schema.test.ts b/src/lib/openapi/spec/application-overview-schema.test.ts
new file mode 100644
index 0000000000..2255b64449
--- /dev/null
+++ b/src/lib/openapi/spec/application-overview-schema.test.ts
@@ -0,0 +1,26 @@
+import { validateSchema } from '../validate';
+
+test('applicationOverviewSchema', () => {
+    const app = {
+        projects: ['default', 'dx'],
+        featureCount: 12,
+        environments: [
+            {
+                name: 'production',
+                instanceCount: 34,
+                sdks: ['unleash-client-node:5.4.0'],
+                lastSeen: '2021-10-01T12:00:00Z',
+            },
+            {
+                name: 'development',
+                instanceCount: 16,
+                sdks: ['unleash-client-java:5.4.0'],
+                lastSeen: '2021-10-01T12:00:00Z',
+            },
+        ],
+    };
+
+    expect(
+        validateSchema('#/components/schemas/applicationOverviewSchema', app),
+    ).toBeUndefined();
+});
diff --git a/src/lib/openapi/spec/application-overview-schema.ts b/src/lib/openapi/spec/application-overview-schema.ts
new file mode 100644
index 0000000000..e0c4310e36
--- /dev/null
+++ b/src/lib/openapi/spec/application-overview-schema.ts
@@ -0,0 +1,42 @@
+import { FromSchema } from 'json-schema-to-ts';
+import { applicationOverviewEnvironmentSchema } from './application-overview-environment-schema';
+
+export const applicationOverviewSchema = {
+    $id: '#/components/schemas/applicationOverviewSchema',
+    type: 'object',
+    description:
+        "Data about an application that's connected to Unleash via an SDK.",
+    additionalProperties: false,
+    required: ['projects', 'featureCount', 'environments'],
+    properties: {
+        projects: {
+            description: 'The list of projects the application has been using.',
+            type: 'array',
+            items: {
+                type: 'string',
+            },
+            example: ['default', 'payment'],
+        },
+        featureCount: {
+            description:
+                'The number of features the application has been using.',
+            type: 'number',
+            example: 5,
+        },
+        environments: {
+            type: 'array',
+            description:
+                'The list of environments the application has been using.',
+            items: {
+                $ref: '#/components/schemas/applicationOverviewEnvironmentSchema',
+            },
+        },
+    },
+    components: {
+        applicationOverviewEnvironmentSchema,
+    },
+} as const;
+
+export type ApplicationOverviewSchema = FromSchema<
+    typeof applicationOverviewSchema
+>;
diff --git a/src/lib/routes/admin-api/metrics.ts b/src/lib/routes/admin-api/metrics.ts
index 261df6bd5f..4abc8b8e8f 100644
--- a/src/lib/routes/admin-api/metrics.ts
+++ b/src/lib/routes/admin-api/metrics.ts
@@ -117,6 +117,25 @@ class MetricsController extends Controller {
                 }),
             ],
         });
+        this.route({
+            method: 'get',
+            path: '/applications/:appName/overview',
+            handler: this.getApplicationOverview,
+            permission: NONE,
+            middleware: [
+                openApiService.validPath({
+                    tags: ['Unstable'],
+                    operationId: 'getApplicationOverview',
+                    summary: 'Get application overview',
+                    description:
+                        'Returns an overview of the specified application (`appName`).',
+                    responses: {
+                        200: createResponseSchema('applicationOverviewSchema'),
+                        ...getStandardResponses(404),
+                    },
+                }),
+            ],
+        });
     }
 
     async deprecated(req: Request, res: Response): Promise<void> {
@@ -174,5 +193,11 @@ class MetricsController extends Controller {
             await this.clientInstanceService.getApplication(appName);
         res.json(appDetails);
     }
+    async getApplicationOverview(
+        req: Request,
+        res: Response<ApplicationSchema>,
+    ): Promise<void> {
+        throw new Error('Not implemented');
+    }
 }
 export default MetricsController;