thank you!
the output is following: (and cpu is allways 0 on a running machine- on the gui i get values)
"balloon" : 4294967296,
"cpu" : 0,
"cpus" : 2,
"disk" : 0,
"diskread" : 9269799424,
"diskwrite" : 19936676864,
"ha" : 0,
"maxdisk" : 1073741824,
"maxmem" ...