Maintain, secure, and upgrade
This was once a long page covering a bunch of topics; those topics have since all moved to dedicated pages:
Moved to Troubleshooting.
Securing your Zulip server
Moved to Security model.
Moved to Upgrading to a release.
Upgrading from a Git repository
Moved to Upgrading from a Git repository.
Upgrading the operating system
Moved to Upgrading the operating system.
Moved to Scalability.
Moved to Management commands.
API and your Zulip URL
Moved to REST API.