Another healthy practice is to catch all exceptions and fall back to reporting UNKNOWN service status so that Nagios can manage notification of this fact appropriately.

另一个好的实践是捕获所有的异常，并后退以报告unknown服务状态，以便Nagios能够正确地管理有关这个情况的通知。

youdao

Operational Status -- The Operational Status capability defines three very simple status levels (available, unavailable, and unknown) as well as events for status changes for interoperability.

运行状态（Operational Status） -- 该运行状态功能不仅定义了用于互操作性状态更改的事件，也定义了三种很简单的状态级别（可用，不可用和未知）。

youdao

The CDC recommends rapid HIV testing during Labour, if the woman's HIV status is unknown.12.

美国国家疾控中心建议，如果对产妇HIV的病毒状况未知时，应该在分娩过程中进行HIV病毒快速检测。

youdao

He says another three African nationals are still missing and their status remains unknown.

VOA: standard.2009.09.01

So often organizations hire people for the status quo, when you really should be hiring for the status unknown.

FORBES: Test of Leadership: Making the Tough Call

More than 90% of those infected had not been vaccinated, or their vaccination status was unknown.

FORBES: Responsibility and the Ethics of Inoculation

Its operational status is unknown at present, but appears mostly complete with obvious Russian-designed fuel elements.

FORBES: Israel Has Nuclear Weapons, But Only Iran Has Nuclear Power