update field comment

        flush_auto

    } flush_packets;            /* control AJP flushing */

    hcmethod_t      method;     /* method to use for health check */

    apr_time_t      updated;    /* timestamp of last update */

    apr_time_t      updated;    /* timestamp of last update for dynamic workers, or queue-time of HC workers */

    apr_time_t      error_time; /* time of the last error */

    apr_interval_time_t ttl;    /* maximum amount of time in seconds a connection

                                 * may be available while exceeding the soft limit */