Add troubleshooting commands

docs/source/troubleshooting.md

@@ -19,6 +19,8 @@ problem and how to resolve it.
 - How do I use JupyterLab's prerelease version with JupyterHub?
 - How do I set up JupyterHub for a workshop (when users are not known ahead of time)?
 
+[*Troubleshooting commands*]()
+
 ## Behavior
 
 ### JupyterHub proxy fails to start
@@ -223,3 +225,27 @@ notebook servers to default to JupyterLab:
 3. Configure admin list to have workshop leaders be listed with administrator privileges.
 
 Users will need a GitHub account to login and be authenticated by the Hub.
+
+## Troubleshooting commands
+
+The following commands provide additional detail about installed packages,
+versions, and system information that may be helpful when troubleshooting
+a JupyterHub deployment. The commands are:
+
+- System and deployment information
+
+```bash
+jupyter troubleshooting
+```
+
+- Kernel information
+
+```bash
+jupyter kernelspec list
+```
+
+- Debug logs when running JupyterHub
+
+```bash
+jupyterhub --debug
+```