Add /notifications endpoint to workers

changelog.d/16265.feature

@@ -0,0 +1 @@
+Allow `/notifications` endpoint to be routed to workers.

docs/workers.md

@@ -246,6 +246,7 @@ information.
     ^/_matrix/client/(r0|v3|unstable)/user/.*/filter(/|$)
     ^/_matrix/client/(api/v1|r0|v3|unstable)/directory/room/.*$
     ^/_matrix/client/(r0|v3|unstable)/capabilities$
+    ^/_matrix/client/(r0|v3|unstable)/notifications$
 
     # Encryption requests
     ^/_matrix/client/(r0|v3|unstable)/keys/query$

synapse/rest/__init__.py

@@ -123,7 +123,7 @@ def register_servlets(client_resource: HttpServer, hs: "HomeServer") -> None:
         if is_main_process:
             report_event.register_servlets(hs, client_resource)
             openid.register_servlets(hs, client_resource)
-            notifications.register_servlets(hs, client_resource)
+        notifications.register_servlets(hs, client_resource)
         devices.register_servlets(hs, client_resource)
         if is_main_process:
             thirdparty.register_servlets(hs, client_resource)

synapse/rest/client/notifications.py

@@ -36,6 +36,8 @@
 class NotificationsServlet(RestServlet):
     PATTERNS = client_patterns("/notifications$")
 
+    CATEGORY = "Client API requests"
+
     def __init__(self, hs: "HomeServer"):
         super().__init__()
         self.store = hs.get_datastores().main