Deprecate the uvicorn.workers module (#2302)

docs/deployment.md

@@ -182,6 +182,15 @@ Uvicorn provides a lightweight way to run multiple worker processes, for example
 
 ### Gunicorn
 
+!!! warning
+    The `uvicorn.workers` module is deprecated and will be removed in a future release.
+
+    You should use the [`uvicorn-worker`](https://github.com/Kludex/uvicorn-worker) package instead.
+
+    ```bash
+    python -m pip install uvicorn-worker
+    ```
+
 Gunicorn is probably the simplest way to run and manage Uvicorn in a production setting. Uvicorn includes a gunicorn worker class that means you can get set up with very little configuration.
 
 The following will start Gunicorn with four worker processes:

docs/index.md

@@ -262,6 +262,15 @@ if __name__ == "__main__":
 
 ### Running with Gunicorn
 
+!!! warning
+    The `uvicorn.workers` module is deprecated and will be removed in a future release.
+
+    You should use the [`uvicorn-worker`](https://github.com/Kludex/uvicorn-worker) package instead.
+
+    ```bash
+    python -m pip install uvicorn-worker
+    ```
+
 [Gunicorn][gunicorn] is a mature, fully featured server and process manager.
 
 Uvicorn includes a Gunicorn worker class allowing you to run ASGI applications,

uvicorn/workers.py

@@ -4,6 +4,7 @@
 import logging
 import signal
 import sys
+import warnings
 from typing import Any
 
 from gunicorn.arbiter import Arbiter
@@ -12,6 +13,12 @@
 from uvicorn.config import Config
 from uvicorn.main import Server
 
+warnings.warn(
+    "The `uvicorn.workers` module is deprecated. Please use `uvicorn-worker` package instead.\n"
+    "For more details, see https://github.com/Kludex/uvicorn-worker.",
+    DeprecationWarning,
+)
+
 
 class UvicornWorker(Worker):
     """