This blog post discusses the use of HashiCorp Vault namespaces for multi-tenant deployments, drawing on practical solutions engineering experience. It explains when namespaces are appropriate and inappropriate to use, provides real-world examples, and shares insights gained from tackling multiple use cases. The text also explores various approaches to structuring Vault namespaces, such as by geographical region, data sensitivity levels, business unit, and application ID. Finally, it offers guidance on moving to a new structure, addressing namespace limits, and testing different options.