def METHOD_NAME(self, metric_name,instance):
    if metric_name == 'proc.psinfo.cmin_flt' and instance == 1:
        return 573930
    if metric_name == 'proc.psinfo.minflt' and instance == 1:
        return 14500
    if metric_name == 'proc.psinfo.cmaj_flt' and instance == 1:
        return 645
    if metric_name == 'proc.psinfo.maj_flt' and instance == 1:
        return 50
    if metric_name == 'proc.psinfo.cmin_flt' and instance == 3:
        return 573930
    if metric_name == 'proc.psinfo.minflt' and instance == 3:
        return 14500
    if metric_name == 'proc.psinfo.cmaj_flt' and instance == 3:
        return 645
    if metric_name == 'proc.psinfo.maj_flt' and instance == 3:
        return 50
    return None