How is "feasibility" defined in fmincon?

It seems there is no clear documents for the feasibility item in the output of fmincon, see the following figure,

Does anyone knows how it is eaxctly defined?

Answer 1

[Alan Weiss]

Or see the documentation of iterative display for fmincon.

Alan Weiss

MATLAB mathematical toolbox documentation

Answer 2

[Torsten]

https://de.mathworks.com/matlabcentral/answers/77808-understanding-output-of-fmincon-optimization-using-sqp-algorithm