HashiCorp Vault is a secrets management tool that securely stores and controls access to sensitive data. It provides a centralized storage solution, robust auditing, and encryption services to safeguard against secret sprawl. With Datadog's integration, you can monitor Vault and receive alerts on unusual activity, ensuring your secret management service is running properly along with the rest of your development architecture. Vaults can exist in two states: sealed or unsealed, with sealed servers becoming operational again once unsealed. A standalone Vault server will become sealed if it restarts unintentionally, but you can set up alerts to notify you if a Vault intended to be unsealed has become sealed. Monitoring leader changes and startup issues is crucial to ensure the stability of your Vault cluster. Integrating HashiCorp Vault with Datadog provides visibility into Vault's status and monitoring of its performance along with other integrated services like Consul and Kubernetes.