I wish to know how to suppress the following warning obtained on qiskit when I try to add two different types of noise to a qubit
WARNING: quantum error already exists for instruction "u2" on qubits  , appending additional error.
I know that some warnings can be suppressed with
import warnings warnings.filterwarnings('ignore', category=DeprecationWarning)
but I do not know what category my warning is contained in. I would also like to know if I can access somewhere all the different warning categories. Additionally trying
import warnings warnings.filterwarnings('ignore')
to suppress all warnings does not help.