Health State

class ska_control_model.HealthState(value)

Python enumerated type for health state.

DEGRADED = 1

The device reports this state when only part of its functionality is available. This value is optional and shall be implemented only where it is useful.

For example, a subarray may report its health state as DEGRADED if one of the dishes that belongs to a subarray is unresponsive (or may report health state as FAILED).

Difference between DEGRADED and FAILED health state shall be clearly identified (quantified) and documented. For example, the difference between a DEGRADED and FAILED subarray might be defined as:

• the number or percent of the dishes available;

• the number or percent of the baselines available;

• sensitivity

or some other criterion. More than one criterion may be defined for a device.

FAILED = 2

The device reports this state when unable to perform core functionality and produce valid output.

OK = 0

A device reports this state when there are no failures that are assessed as affecting the ability of the device to perform its function.

UNKNOWN = 3

The device reports this state when unable to determine its health.

This is also an initial state, indicating that health state has not yet been determined.