backend-plugin-api: fix typings in health service

Signed-off-by: Vincenzo Scamporlino <vincenzos@spotify.com>

docs/backend-system/core-services/root-health.md

@@ -17,12 +17,12 @@ import { RootHealthService, coreServices } from '@backstage/backend-plugin-api';
 const backend = createBackend();
 
 class MyRootHealthService implements RootHealthService {
-  async getLiveness(): Promise<{ status: number; payload?: any }> {
+  async getLiveness() {
     // provide your own implementation
     return { status: 200, payload: { status: 'ok' } };
   }
 
-  async getReadiness(): Promise<{ status: number; payload?: any }> {
+  async getReadiness() {
     // provide your own implementation
     return { status: 200, payload: { status: 'ok' } };
   }

packages/backend-plugin-api/api-report.md

@@ -505,11 +505,11 @@ export interface RootConfigService extends Config {}
 export interface RootHealthService {
   getLiveness(): Promise<{
     status: number;
-    payload?: any;
+    payload?: JsonValue;
   }>;
   getReadiness(): Promise<{
     status: number;
-    payload?: any;
+    payload?: JsonValue;
   }>;
 }
 

packages/backend-plugin-api/src/services/definitions/RootHealthService.ts

@@ -14,6 +14,8 @@
  * limitations under the License.
  */
 
+import { JsonValue } from '@backstage/types';
+
 /**
  * @public
  */
@@ -21,9 +23,9 @@ export interface RootHealthService {
   /**
    * Get the liveness status of the backend.
    */
-  getLiveness(): Promise<{ status: number; payload?: any }>;
+  getLiveness(): Promise<{ status: number; payload?: JsonValue }>;
   /**
    * Get the readiness status of the backend.
    */
-  getReadiness(): Promise<{ status: number; payload?: any }>;
+  getReadiness(): Promise<{ status: number; payload?: JsonValue }>;
 }