I’m new to Kubernetes, and I want to get the available memory of a node, so I used the Summary API to get the specific status of a node, finally I got a json result with other information omitted:

// curl http://localhost:8001/api/v1/nodes/{my_node_name}/proxy/stats/summary
{
  "node": {
    "nodeName": "master",
    "systemContainers": ...,
    "startTime": "2024-04-17T03:07:20Z",
    "cpu": ...,
    "memory": {
      "time": "2024-04-29T11:46:36Z",
      "availableBytes": 1989132288,
      "usageBytes": 3017809920,
      "workingSetBytes": 1964838912,
      "rssBytes": 1445163008,
      "pageFaults": 70987132,
      "majorPageFaults": 149
    },
    ...
  },
  ...
}

Is availableBytes the result I want?

How does cAdvisor obtain this value? I found that this value is different from that displayed by the free command. Doesn’t this value come from /proc/meminfo?

I checked https://github.com/google/cadvisor but still got no answers.