Add migration guide for Prometheus integration at the cluster level (#22086)

Author: handlerww

TOC-tidb-cloud.md

@@ -164,6 +164,7 @@
     - Third-Party Metrics Integrations
       - [Overview](/tidb-cloud/third-party-monitoring-integrations.md)
       - [Migrate Datadog and New Relic Integrations](/tidb-cloud/migrate-metrics-integrations.md)
+      - [Migrate Prometheus Integrations](/tidb-cloud/migrate-prometheus-metrics-integrations.md)
     - [TiDB Cloud Clinic](/tidb-cloud/tidb-cloud-clinic.md)
   - Tune Performance
     - [Overview](/tidb-cloud/tidb-cloud-tune-performance-overview.md)

tidb-cloud/migrate-prometheus-metrics-integrations.md

@@ -0,0 +1,44 @@
+---
+title: Migrate Prometheus Integrations
+summary: Learn how to migrate from the legacy project-level Prometheus integration to the new cluster-level Prometheus integrations.
+---
+
+# Migrate Prometheus Integrations
+
+TiDB Cloud now manages [Prometheus integrations](/tidb-cloud/monitor-prometheus-and-grafana-integration.md) at the cluster level, offering more granular control and configuration. The legacy project-level Prometheus integrations (Beta) will be deprecated on January 6, 2026. If your organization is still using these legacy integrations, follow this guide to migrate them to the new cluster-level Prometheus integrations to minimize disruptions to your metrics-related services.
+
+## Prerequisites
+
+- To set up third-party metrics integration for TiDB Cloud, you must have the `Organization Owner` or `Project Owner` access in TiDB Cloud.
+
+## Migration steps
+
+Do the following to migrate the Prometheus integration.
+
+### Step 1. Delete the legacy project-level Prometheus integrations (Beta)
+
+1. In the [TiDB Cloud console](https://tidbcloud.com/), switch to the target project using the combo box in the upper-left corner.
+
+2. In the left navigation panel, click **Project Settings** > **Integrations**.
+
+3. On the **Integrations** > **Integration to Prometheus (BETA)** module, select **Scrape_config Files** and click **Delete**.
+
+4. In the displayed dialog, type `Delete` to confirm the removal of the legacy integration.
+
+### Step 2. Create a new cluster-level Prometheus integration for each cluster
+
+Repeat the following steps for each [TiDB Cloud Dedicated](/tidb-cloud/select-cluster-tier.md#tidb-cloud-dedicated) cluster in the project.
+
+1. In the [TiDB Cloud console](https://tidbcloud.com/), navigate to the [**Clusters**](https://tidbcloud.com/project/clusters) page of your project, and then click the name of your target cluster to go to its overview page.
+
+2. In the left navigation panel, click **Settings** > **Integrations**.
+
+3. On the **Integrations** page, create a new Prometheus integration. For more information, see [Integrate TiDB Cloud with Prometheus and Grafana](/tidb-cloud/monitor-prometheus-and-grafana-integration.md).
+
+## Impact of deleting the project-level Prometheus integration (Beta)
+
+Deleting the project-level Prometheus integration (Beta) immediately stops all clusters in the project from exposing metrics to the Prometheus endpoint. This results in a temporary loss of downstream data and interrupts integration-related services (such as monitoring and alerts) until you configure new cluster-level Prometheus integrations.
+
+## Contact support
+
+For assistance, contact TiDB Cloud support at <a href="mailto:support@pingcap.com">support@pingcap.com</a> or reach out to your Technical Account Manager (TAM).