This object sets the connect-test interval used for empirically verifying that the service is actually available on the configured port for this host, with 0 disabling the connect test. This is distinct from the URL-based check, since a simple TCP connect test is lighter-weight and can catch a service that's completely down even faster or with less overhead than fetching a full web page. An admin might run both a fast connect-test interval of a few seconds to quickly catch a fully down server, alongside a slower URL-check interval to periodically confirm the application layer is also healthy, not just the listening port.