The `/sys/auth` endpoint is used to list, create, update, and delete auth
methods. Auth methods convert user or machine-supplied information into a
token which can be used for all future requests.

Reference: https://www.vaultproject.io/api-docs/system/auth

The `/sys/health` endpoint is used to check the health status of Vault.

Reference: https://www.vaultproject.io/api-docs/system/health

The `/sys/leases` endpoint is used to view and manage leases in Vault.

Reference: https://www.vaultproject.io/api-docs/system/leases

The `/sys/mounts` endpoint is used to manage secrets engines in Vault.

Reference: https://www.vaultproject.io/api-docs/system/mounts

The `/sys/wrapping` endpoint is used to wrap secrets and lookup, rewrap, and
unwrap tokens.

Reference:
- https://www.vaultproject.io/api-docs/system/wrapping-lookup
- https://www.vaultproject.io/api-docs/system/wrapping-rewrap
- https://www.vaultproject.io/api-docs/system/wrapping-unwrap
- https://www.vaultproject.io/api-docs/system/wrapping-wrap