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trentm avatar trentm commented on September 27, 2024

Hi @birladeanuadrian. Thanks for the issue.

The system.process.memory.usage

Do you mean system.process.memory.rss.bytes (https://www.elastic.co/guide/en/apm/agent/nodejs/current/metrics.html#metric-system.process.memory.rss.bytes) or perhaps system.process.memory.size? The Node.js APM agent doesn't report a metric named system.process.memory.usage.

Using /sys/fs/cgroup/memory might require some defensiveness. Testing in a kind k8s cluster on macOS there isn't such a dir:

~ # ls /sys/fs/cgroup/memory
ls: /sys/fs/cgroup/memory: No such file or directory
~ # ls /sys/fs/cgroup
cgroup.controllers        cpu.stat                  hugetlb.2MB.rsvd.max      memory.reclaim
cgroup.events             cpu.weight                io.bfq.weight             memory.stat
cgroup.freeze             cpu.weight.nice           io.latency                memory.swap.current
cgroup.kill               cpuset.cpus               io.max                    memory.swap.events
cgroup.max.depth          cpuset.cpus.effective     io.stat                   memory.swap.high
cgroup.max.descendants    cpuset.cpus.partition     memory.current            memory.swap.max
cgroup.procs              cpuset.mems               memory.events             pids.current
cgroup.stat               cpuset.mems.effective     memory.events.local       pids.events
cgroup.subtree_control    hugetlb.2MB.current       memory.high               pids.max
cgroup.threads            hugetlb.2MB.events        memory.low                pids.peak
cgroup.type               hugetlb.2MB.events.local  memory.max                rdma.current
cpu.idle                  hugetlb.2MB.max           memory.min                rdma.max
cpu.max                   hugetlb.2MB.numa_stat     memory.oom.group
cpu.max.burst             hugetlb.2MB.rsvd.current  memory.peak

I found docker/for-mac#6118 but I haven't read through it. I see mention of cgroupsv1 vs cgroupsv2, but I'm not sure if that is a relevant difference.

Do you happen to know of an authoritative reference for /sys/fs/cgroup/memory?

I found https://stackoverflow.com/questions/50865763/memory-usage-discrepancy-cgroup-memory-usage-in-bytes-vs-rss-inside-docker-con as well that seems to discuss the differences in various ways to get memory info. I haven't read through this yet, either.

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trentm avatar trentm commented on September 27, 2024

Ah... our APM agents already have a spec for report cgroup memory metrics: https://github.com/elastic/apm/blob/main/specs/agents/metrics.md#cgroup-metrics

And we have this (sadly languishing) issue to implement those in this agent: #1813

So I believe this issue is effectively a duplicate (and vote for) #1813.

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trentm avatar trentm commented on September 27, 2024

I'll resolve this as a duplicate, and I've made a node to discuss adding #1813 to upcoming planning.

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