In this text, the author discusses various methods and tools for monitoring the health and performance of a HashiCorp Vault deployment. These include querying Vault's HTTP APIs for telemetry data, using the vault debug command to gather information about the cluster over time, utilizing the built-in web UI, viewing server logs and audit logs, and forwarding Vault telemetry data to third-party monitoring solutions. The author also highlights the importance of comprehensive visibility across all components of a Vault deployment for effective troubleshooting and performance optimization.