feat: [DatabaseCenter] Adding Method AggregateFleet of Database Center API v1beta (#8828)

* feat: Adding Method QueryDatabaseResourceGroups of Database Center API v1beta

This release includes:
-   `DatabaseCenter` service with `QueryDatabaseResourceGroups` method.
-   `All related enums.

PiperOrigin-RevId: 850334121

Source-Link: googleapis/googleapis@b607ece

Source-Link: googleapis/googleapis-gen@f1aa0f6
Copy-Tag: eyJwIjoiRGF0YWJhc2VDZW50ZXIvLk93bEJvdC55YW1sIiwiaCI6ImYxYWEwZjY0YTRhYzJlNjk5OTI2MWIzYThlZTExZTg4YzYyZjJiZmEifQ==

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* feat: add custom prompt config in the request and return prompt in the response
feat: update min_speaker_count and max_speaker_count to be optional
docs: Clarify that min_speaker_count and max_speaker_count in SpeakerDiarizationConfig are not currently used
docs: Update guidance on how to enable speaker diarization; to enable, set the diarization_config field to an empty SpeakerDiarizationConfig message

PiperOrigin-RevId: 852383212

Source-Link: googleapis/googleapis@1a14153

Source-Link: googleapis/googleapis-gen@c84243c
Copy-Tag: eyJwIjoiRGF0YWJhc2VDZW50ZXIvLk93bEJvdC55YW1sIiwiaCI6ImM4NDI0M2NhYTExYzdmYzg5MDU2ZTBiZDA3YjRjNGM2YWVhMDUxMGIifQ==

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

* feat: Adding Method AggregateFleet of Database Center API v1beta

This release includes:
-   `DatabaseCenter` service with `AggregateFleet` method.
-   `All related enums.

PiperOrigin-RevId: 853112628

Source-Link: googleapis/googleapis@5f9683c

Source-Link: googleapis/googleapis-gen@7588645
Copy-Tag: eyJwIjoiRGF0YWJhc2VDZW50ZXIvLk93bEJvdC55YW1sIiwiaCI6Ijc1ODg2NDVhYWRjZTEwNWYzNTJlMWQwZWQ0NDY2ODIxYzlkMzRmOTcifQ==

* 🦉 Updates from OwlBot post-processor

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

---------

Co-authored-by: Owl Bot <gcf-owl-bot[bot]@users.noreply.github.com>

Author: gcf-owl-bot[bot]

DatabaseCenter/metadata/V1Beta/MachineConfig.php

@@ -0,0 +1,85 @@
+<?php
+/*
+ * Copyright 2026 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * GENERATED CODE WARNING
+ * This file was automatically generated - do not edit!
+ */
+
+require_once __DIR__ . '/../../../vendor/autoload.php';
+
+// [START databasecenter_v1beta_generated_DatabaseCenter_AggregateFleet_sync]
+use Google\ApiCore\ApiException;
+use Google\ApiCore\PagedListResponse;
+use Google\Cloud\DatabaseCenter\V1beta\AggregateFleetRequest;
+use Google\Cloud\DatabaseCenter\V1beta\AggregateFleetRow;
+use Google\Cloud\DatabaseCenter\V1beta\Client\DatabaseCenterClient;
+
+/**
+ * AggregateFleet provides statistics about the fleet grouped by various
+ * fields.
+ *
+ * @param string $parent Parent can be a project, a folder, or an organization. The search
+ *                       is limited to the resources within the `scope`.
+ *
+ *                       The allowed values are:
+ *
+ *                       * projects/{PROJECT_ID} (e.g., "projects/foo-bar")
+ *                       * projects/{PROJECT_NUMBER} (e.g., "projects/12345678")
+ *                       * folders/{FOLDER_NUMBER} (e.g., "folders/1234567")
+ *                       * organizations/{ORGANIZATION_NUMBER} (e.g.,
+ *                       "organizations/123456")
+ */
+function aggregate_fleet_sample(string $parent): void
+{
+    // Create a client.
+    $databaseCenterClient = new DatabaseCenterClient();
+
+    // Prepare the request message.
+    $request = (new AggregateFleetRequest())
+        ->setParent($parent);
+
+    // Call the API and handle any network failures.
+    try {
+        /** @var PagedListResponse $response */
+        $response = $databaseCenterClient->aggregateFleet($request);
+
+        /** @var AggregateFleetRow $element */
+        foreach ($response as $element) {
+            printf('Element data: %s' . PHP_EOL, $element->serializeToJsonString());
+        }
+    } catch (ApiException $ex) {
+        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
+    }
+}
+
+/**
+ * Helper to execute the sample.
+ *
+ * This sample has been automatically generated and should be regarded as a code
+ * template only. It will require modifications to work:
+ *  - It may require correct/in-range values for request initialization.
+ *  - It may require specifying regional endpoints when creating the service client,
+ *    please see the apiEndpoint client configuration option for more details.
+ */
+function callSample(): void
+{
+    $parent = '[PARENT]';
+
+    aggregate_fleet_sample($parent);
+}
+// [END databasecenter_v1beta_generated_DatabaseCenter_AggregateFleet_sync]

DatabaseCenter/metadata/V1Beta/Maintenance.php

@@ -0,0 +1,83 @@
+<?php
+/*
+ * Copyright 2025 Google LLC
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/*
+ * GENERATED CODE WARNING
+ * This file was automatically generated - do not edit!
+ */
+
+require_once __DIR__ . '/../../../vendor/autoload.php';
+
+// [START databasecenter_v1beta_generated_DatabaseCenter_QueryDatabaseResourceGroups_sync]
+use Google\ApiCore\ApiException;
+use Google\ApiCore\PagedListResponse;
+use Google\Cloud\DatabaseCenter\V1beta\Client\DatabaseCenterClient;
+use Google\Cloud\DatabaseCenter\V1beta\DatabaseResourceGroup;
+use Google\Cloud\DatabaseCenter\V1beta\QueryDatabaseResourceGroupsRequest;
+
+/**
+ * QueryDatabaseResourceGroups returns paginated results of database groups.
+ *
+ * @param string $parent Parent can be a project, a folder, or an organization. The search
+ *                       is limited to the resources within the `scope`.
+ *
+ *                       The allowed values are:
+ *
+ *                       * projects/{PROJECT_ID} (e.g., "projects/foo-bar")
+ *                       * projects/{PROJECT_NUMBER} (e.g., "projects/12345678")
+ *                       * folders/{FOLDER_NUMBER} (e.g., "folders/1234567")
+ *                       * organizations/{ORGANIZATION_NUMBER} (e.g., "organizations/123456")
+ */
+function query_database_resource_groups_sample(string $parent): void
+{
+    // Create a client.
+    $databaseCenterClient = new DatabaseCenterClient();
+
+    // Prepare the request message.
+    $request = (new QueryDatabaseResourceGroupsRequest())
+        ->setParent($parent);
+
+    // Call the API and handle any network failures.
+    try {
+        /** @var PagedListResponse $response */
+        $response = $databaseCenterClient->queryDatabaseResourceGroups($request);
+
+        /** @var DatabaseResourceGroup $element */
+        foreach ($response as $element) {
+            printf('Element data: %s' . PHP_EOL, $element->serializeToJsonString());
+        }
+    } catch (ApiException $ex) {
+        printf('Call failed with message: %s' . PHP_EOL, $ex->getMessage());
+    }
+}
+
+/**
+ * Helper to execute the sample.
+ *
+ * This sample has been automatically generated and should be regarded as a code
+ * template only. It will require modifications to work:
+ *  - It may require correct/in-range values for request initialization.
+ *  - It may require specifying regional endpoints when creating the service client,
+ *    please see the apiEndpoint client configuration option for more details.
+ */
+function callSample(): void
+{
+    $parent = '[PARENT]';
+
+    query_database_resource_groups_sample($parent);
+}
+// [END databasecenter_v1beta_generated_DatabaseCenter_QueryDatabaseResourceGroups_sync]