feat: add deprecation warning for metrics (#7151)

* feat: add deprecation warning for metrics

* fix: add note QC does not support metrics

* enhance: coderabbit comments

* fix: broken url

Author: ankur-arch

content/200-orm/200-prisma-client/600-observability-and-logging/240-metrics.mdx

@@ -6,17 +6,30 @@ sidebar_class_name: preview-badge
 toc_max_heading_level: 4
 ---
 
-<TopBlock>
 
 Prisma Client metrics give you a detailed insight into how Prisma Client interacts with your database. You can use this insight to help diagnose performance issues with your application.
 
-<Admonition type="info">
+:::info 
 
 If you want an even more detailed insight into your Prisma Client's performance, at the level of individual operations, see [Tracing](/orm/prisma-client/observability-and-logging/opentelemetry-tracing).
 
-</Admonition>
+:::
+
+:::warning[`metrics` preview feature is deprecated]
+
+The `metrics` preview feature has been **deprecated** as of [Prisma ORM v6.14.0](https://github.com/prisma/prisma/releases/tag/6.14.0) and will be removed in Prisma ORM v7.  
+
+**The `metrics` preview feature is only available in Prisma ORM versions ≤6.13.x.** If you are using Prisma ORM v6.14.0 or later, the `$metrics` API is no longer available.
+
+The feature is not supported when using Prisma ORM with the  [query compiler architecture](/orm/prisma-client/setup-and-configuration/no-rust-engine) (setting `engineType` to 'client' in the `generator` block of your `schema.prisma` file).
+
+Metrics were originally introduced to provide insights into query and connection behavior. With the changes in the new [query compiler architecture](/orm/prisma-client/setup-and-configuration/no-rust-engine), these values no longer reflect the system reliably. Because of this, we are not continuing support for this feature. 
+
+If you need visibility into query or connection pool behavior, we recommend using the *native metrics provided by your database driver* (for example, pool statistics) or setting up *OpenTelemetry* for a more complete observability solution.  
+
+:::
+
 
-</TopBlock>
 
 ## About metrics
 
@@ -50,18 +63,33 @@ You can [add global labels to your metrics data](#global-labels) to help you gro
 
 ## Prerequisites
 
+:::warning[Version compatibility]
+
+The `metrics` preview feature is **only available in Prisma ORM versions ≤6.13.x**. It has been removed in v6.14.0 and later versions.
+
+:::
+
 To use Prisma Client metrics, you must do the following:
 
-1. [Install the appropriate dependencies](#1-install-up-to-date-prisma-orm-dependencies).
+1. [Install compatible Prisma ORM dependencies](#1-install-up-to-date-prisma-orm-dependencies).
 1. [Enable the `metrics` feature flag in your Prisma schema file](#2-enable-the-feature-flag-in-the-prisma-schema-file).
 
 ### 1. Install up-to-date Prisma ORM dependencies
 
-Use version `3.15.0` or higher of the `prisma` and `@prisma/client` npm packages.
+You must use a version between `3.15.0` and `6.13.x` of the `prisma` and `@prisma/client` npm packages.
+
+**Install a compatible version:**
+
+```terminal
+npm install [email protected] --save-dev
+npm install @prisma/[email protected]
+```
+
+**Or use a version range that stays within the compatible range:**
 
 ```terminal
-npm install prisma@latest --save-dev
-npm install @prisma/client@latest
+npm install prisma@">=3.15.0 <6.14.0" --save-dev
+npm install @prisma/client@">=3.15.0 <6.14.0"
 ```
 
 ### 2. Enable the feature flag in the Prisma schema file