Netdata installed in LXC retrieves statistics from bare-metal

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Netdata collects system metrics reading /proc/*. RAM metrics come from /proc/meminfo:

  • free is MemFree.
  • cached is Cached + SReclaimable - Shmem.
  • used is MemTotal - MemFree - MemCached - Buffers.

You can check the values yourself, e.g. grep MemFree /proc/meminfo from inside the container.

Source code link.