This API resource supports the qq sso_login command. Begin an interactive SAML single sign-on (SSO) authentication process for the cluster. Return the login_id and login_url strings required for the user to complete the authentication process. If SSO is not enabled on the cluster, return saml_not_configured_error. To complete in-browser authentication, the caller must pass the login_url parameter to the user. The caller must use the login_id parameter to poll the retrieve-saml-login API for SAML SSO credentials until the user completes the authentication process in the browser, or until the 5-minute limit elapses.