How to correctly monitor containers ram usage?

Help
1

Hi, I’ve got a little problem monitoring containers (lxc and openvz)
sample output of free -m
total used free shared buffers cached
Mem: 512 49 462 969 0 23

In fact this containers memory usage is just 26MB, so how can i monitor this correct?
htop:

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proxmox webinterface:
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librenms:

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in fact this container got a constant ram usage of 20-30mb ram, so librenms graphs are false and i always get notifications…

2

We’re reporting back what the OS is telling us. I think this has been covered before so have a search around for more info.

3

Well but doesn’t htop do the same? Its reporting the correct ram usage, what is different for librenms?
And is there no way to adjust this?