HashiCorp Vault is a secrets management tool that securely stores and tightly controls access to sensitive data such as tokens, passwords, certificates, encryption keys, etc. Datadog's new integration allows users to monitor Vault and ensure its proper functioning along with the rest of the development architecture that relies on it. The integration includes alerts for unexpected sealing of Vault servers, leader changes in high-availability mode, and verification of Vault initialization. By integrating HashiCorp Vault with Datadog, users can monitor their secrets management system alongside other integrated services like Consul and Kubernetes in one place, providing visibility into Vault along with the rest of the technologies in their stack.