basic enhancements for import logging (elastic#196056)

## Summary
Hello, this is a follow up PR to elastic#192234 . The previous PR added
simplistic logging to the saved objects importer. The goal now is to
enhance the logs with information on the saved objects being imported,
how they are imported, and by displaying any errors.

#### `import_saved_objects.ts`:
- Logs specific types being imported
- Logs size limit and overwrite status
- Logs Success/Fail messages

#### Changes to `saved_objects_importer.ts`:
- Passes the logger to `importSavedObjectsFromStream` 
- Removes "starting import"

#### Changes to `import_saved_objects.test.ts`:
- Updates it for the new logger parameter

#### Changes to `import.test.ts`:
- Uses the mock logger provided by core, instead of using a custom one

### Checklist

- [x] [Unit or functional
tests](https://www.elastic.co/guide/en/kibana/master/development-tests.html)
were updated or added to match the most common scenarios
- [ ] [Flaky Test
Runner](https://ci-stats.kibana.dev/trigger_flaky_test_runner/1) was
used on any tests changed

### For maintainers

- [ ] This was checked for breaking API changes and was [labeled
appropriately](https://www.elastic.co/guide/en/kibana/master/contributing.html#_add_your_labels)
- [ ] This will appear in the **Release Notes** and follow the
[guidelines](https://www.elastic.co/guide/en/kibana/master/contributing.html#kibana-release-notes-process)

---------

Co-authored-by: Elastic Machine <[email protected]>
Co-authored-by: kibanamachine <[email protected]>
Co-authored-by: Alejandro Fernández Haro <[email protected]>

packages/core/saved-objects/core-saved-objects-import-export-server-internal/src/import/import_saved_objects.test.ts

@@ -19,6 +19,7 @@ import {
 } from './import_saved_objects.test.mock';
 
 import { Readable } from 'stream';
+import { loggerMock, type MockedLogger } from '@kbn/logging-mocks';
 import { v4 as uuidv4 } from 'uuid';
 import type {
   SavedObjectsImportFailure,
@@ -40,8 +41,10 @@ import {
 import type { ImportStateMap } from './lib';
 
 describe('#importSavedObjectsFromStream', () => {
+  let logger: MockedLogger;
   beforeEach(() => {
     jest.clearAllMocks();
+    logger = loggerMock.create();
     // mock empty output of each of these mocked modules so the import doesn't throw an error
     mockCollectSavedObjects.mockResolvedValue({
       errors: [],
@@ -72,7 +75,6 @@ describe('#importSavedObjectsFromStream', () => {
   let savedObjectsClient: jest.Mocked<SavedObjectsClientContract>;
   let typeRegistry: jest.Mocked<ISavedObjectTypeRegistry>;
   const namespace = 'some-namespace';
-
   const setupOptions = ({
     createNewCopies = false,
     getTypeImpl = (type: string) =>
@@ -102,6 +104,7 @@ describe('#importSavedObjectsFromStream', () => {
       createNewCopies,
       importHooks,
       managed,
+      log: logger,
     };
   };
   const createObject = ({

packages/core/saved-objects/core-saved-objects-import-export-server-internal/src/import/import_saved_objects.ts

@@ -17,6 +17,7 @@ import type {
   ISavedObjectTypeRegistry,
   SavedObjectsImportHook,
 } from '@kbn/core-saved-objects-server';
+import type { Logger } from '@kbn/logging';
 import {
   checkReferenceOrigins,
   validateReferences,
@@ -59,6 +60,7 @@ export interface ImportSavedObjectsOptions {
    * If provided, Kibana will apply the given option to the `managed` property.
    */
   managed?: boolean;
+  log: Logger;
 }
 
 /**
@@ -79,7 +81,11 @@ export async function importSavedObjectsFromStream({
   refresh,
   compatibilityMode,
   managed,
+  log,
 }: ImportSavedObjectsOptions): Promise<SavedObjectsImportResponse> {
+  log.debug(
+    `Importing with overwrite ${overwrite ? 'enabled' : 'disabled'} and size limit ${objectLimit}`
+  );
   let errorAccumulator: SavedObjectsImportFailure[] = [];
   const supportedTypes = typeRegistry.getImportableAndExportableTypes().map((type) => type.name);
 
@@ -90,6 +96,11 @@ export async function importSavedObjectsFromStream({
     supportedTypes,
     managed,
   });
+  log.debug(
+    `Importing types: ${[
+      ...new Set(collectSavedObjectsResult.collectedObjects.map((obj) => obj.type)),
+    ].join(', ')}`
+  );
   errorAccumulator = [...errorAccumulator, ...collectSavedObjectsResult.errors];
   // Map of all IDs for objects that we are attempting to import, and any references that are not included in the read stream;
   // each value is empty by default
@@ -197,7 +208,17 @@ export async function importSavedObjectsFromStream({
     objects: createSavedObjectsResult.createdObjects,
     importHooks,
   });
-
+  if (errorAccumulator.length > 0) {
+    log.error(
+      `Failed to import saved objects. ${errorAccumulator.length} errors: ${JSON.stringify(
+        errorAccumulator
+      )}`
+    );
+  } else {
+    log.info(
+      `Successfully imported ${createSavedObjectsResult.createdObjects.length} saved objects.`
+    );
+  }
   return {
     successCount: createSavedObjectsResult.createdObjects.length,
     success: errorAccumulator.length === 0,

packages/core/saved-objects/core-saved-objects-import-export-server-internal/src/import/saved_objects_importer.ts

@@ -62,7 +62,6 @@ export class SavedObjectsImporter implements ISavedObjectsImporter {
     compatibilityMode,
     managed,
   }: SavedObjectsImportOptions): Promise<SavedObjectsImportResponse> {
-    this.#log.debug('Starting the import process');
     return importSavedObjectsFromStream({
       readStream,
       createNewCopies,
@@ -75,6 +74,7 @@ export class SavedObjectsImporter implements ISavedObjectsImporter {
       typeRegistry: this.#typeRegistry,
       importHooks: this.#importHooks,
       managed,
+      log: this.#log,
     });
   }
 

src/core/server/integration_tests/saved_objects/routes/import.test.ts

@@ -13,7 +13,6 @@ import supertest from 'supertest';
 import { SavedObjectsErrorHelpers } from '@kbn/core-saved-objects-server';
 import { savedObjectsClientMock } from '@kbn/core-saved-objects-api-server-mocks';
 import type { ICoreUsageStatsClient } from '@kbn/core-usage-data-base-server-internal';
-import type { Logger, LogLevelId } from '@kbn/logging';
 import {
   coreUsageStatsClientMock,
   coreUsageDataServiceMock,
@@ -28,6 +27,7 @@ import {
   type InternalSavedObjectsRequestHandlerContext,
 } from '@kbn/core-saved-objects-server-internal';
 import { setupServer, createExportableType } from '@kbn/core-test-helpers-test-utils';
+import { loggerMock, type MockedLogger } from '@kbn/logging-mocks';
 
 type SetupServerReturn = Awaited<ReturnType<typeof setupServer>>;
 
@@ -41,6 +41,7 @@ describe(`POST ${URL}`, () => {
   let httpSetup: SetupServerReturn['httpSetup'];
   let handlerContext: SetupServerReturn['handlerContext'];
   let savedObjectsClient: ReturnType<typeof savedObjectsClientMock.create>;
+  let mockLogger: MockedLogger;
 
   const emptyResponse = { saved_objects: [], total: 0, per_page: 0, page: 0 };
   const mockIndexPattern = {
@@ -57,20 +58,10 @@ describe(`POST ${URL}`, () => {
     references: [],
     managed: false,
   };
-  const mockLogger: jest.Mocked<Logger> = {
-    debug: jest.fn(),
-    info: jest.fn(),
-    error: jest.fn(),
-    warn: jest.fn(),
-    trace: jest.fn(),
-    fatal: jest.fn(),
-    log: jest.fn(),
-    isLevelEnabled: jest.fn((level: LogLevelId) => true),
-    get: jest.fn(() => mockLogger),
-  };
 
   beforeEach(async () => {
     ({ server, httpSetup, handlerContext } = await setupServer());
+    mockLogger = loggerMock.create();
     handlerContext.savedObjects.typeRegistry.getImportableAndExportableTypes.mockReturnValue(
       allowedTypes.map(createExportableType)
     );