Unit

The unit is a base object that makes up the diagnostic graph. Any derived object can be used where a unit object is required.

Format

Name	Type	Required	Description
path	string	no	Any string to reference from other units.
type	string	yes	The string indicating the type of derived object.
dependent	string	no	The path of the dependent unit.
latch	float	no	The latch seconds for this unit.
$derived argument	any	no	Additional arguments for constructing the derived object of given type

Derived object types

$derived_arguments denotes additional arguments to be passed for constructing the object which is specified by type parameter. For example, if "and" is provided as type, list parameter is also required.

• diag
• link
• and
• or
• remapping
  • warn-to-ok
  • warn-to-error
• constant
  • ok
  • warn
  • error
  • stale

Dependent failure

The dependent field defines dependencies between units that do not have a parent-child relationship in the tree. If the unit specified in this field is not OK, the is_dependent field in the node status will be true. This allows the user to easily rule out units other than the root cause.

Latch

If the latch field is set to a number of seconds, the worst level will be latched after the specified time has elapsed. If the field is not specified, the latch is disabled and the input and output levels always match.

This is when the latch is set to 0.0 seconds.

This is when the latch is set to 2.0 seconds.

Error level is also considered warning level. This is when the latch is set to 2.0 seconds.

When the latch is cleared, the decision starts again from that moment, independent of the previous error duration. This is when the latch is set to 2.0 seconds.