~$ pquery "node_memory_MemFree_bytes{instance='node1'}/1024/1024 > 300" \  
  | jq .data.result[].value[1]
 
~$ pquery "node_memory_MemFree_bytes{instance='node1'}/1024/1024 < 300" \ 
  | jq .data.result[].value[1]
"253.40625"
