Node Stats API returns string values for os.cgroup.memory stats

[inqueue]

Elasticsearch Version

8.7.0-SNAPSHOT

Installed Plugins

No response

Java Version

bundled

OS Version

Ubuntu 20.04

Problem Description

Actual

The Node Stats API returns string values for os.cgroup.memory.limit_in_bytes and os.cgroup.memory.usage_in_bytes. Other cgroup stats are numeric as expected; only memory is affected.

Expected

Return numeric values for os.cgroup.memory.limit_in_bytes and os.cgroup.memory.usage_in_bytes.

Impact

Rally's node-stats telemetry device recursively walks node stats keys, returning only integer and float values.

Steps to Reproduce

GET /_nodes/stats?filter_path=**.os.cgroup.memory

    "0VowceokTa2yIegiCvFqAg": {
      "os": {
        "cgroup": {
          "memory": {
            "control_group": "/",
            "limit_in_bytes": "32000000000",
            "usage_in_bytes": "23180730368"
          }
        }
      }
    }

Logs (if relevant)

No response

[inqueue]

The docs state these two keys are intentionally strings. In light, I'll change the issue to an enhancement.

[elasticsearchmachine]

Pinging @elastic/es-core-infra (Team:Core/Infra)

[grcevski]

I think the issue is that long values in JSON don't translate well in certain programming languages. Namely, JavaScript internally uses double to represent longs, so not all long values can be correctly parsed. I think strings are the correct choice here.