added remove_named_servers setting

docs/topic/idle-culler.md

@@ -40,6 +40,12 @@ the users will not be culled alongside their notebooks and will continue to exis
 services.cull.users = False
 ```
 
+If named servers are in use, they are not removed after being culled.
+
+```python
+services.cull.remove_named_servers = False
+```
+
 ## Configuring the idle culler
 
 The available configuration options are:
@@ -76,6 +82,16 @@ sudo tljh-config set services.cull.max_age <server-max-age>
 sudo tljh-config reload
 ```
 
+### Remove Named Servers
+
+Remove named servers after they are shutdown. Only applies if named servers are
+enabled on the hub installation:
+
+```bash
+sudo tljh-config set services.cull.remove_named_servers True
+sudo tljh-config reload
+```
+
 ### User culling
 
 In addition to servers, it is also possible to cull the users. This is usually

tljh/configurer.py

@@ -59,6 +59,7 @@ default = {
             "concurrency": 5,
             "users": False,
             "max_age": 0,
+            "remove_named_servers": False
         },
         "configurator": {"enabled": False},
     },
@@ -256,6 +257,8 @@ def set_cull_idle_service(config):
     cull_cmd += ["--max-age=%d" % cull_config["max_age"]]
     if cull_config["users"]:
         cull_cmd += ["--cull-users"]
+    if cull_config["remove_named_servers"]:
+        cull_cmd += ["--remove-named-servers"]
 
     cull_service = {
         "name": "cull-idle",