Truke KF implements one aspect from ISO 26262 that helps identifying events or actions as safety-relevant. It does this by enabling the use of labels for severity, exposure and controllability that are defined in ISO 26262 and allow KF to calculate the corresponding ASIL level.
If any of these labels is used in an event, the risk matrix used for that event is the ASIL table from ISO 26262. Otherwise the default risk matrix is used (the one specified in kf.ini).