Restore upstream psutil or find an alternative

[michaelsproul]

Description

We've moved to a fork version of psutil in #2699 to patch a vulnerable dependency. Once the vulnerable dep is patched upstream we should migrate back.

Tracking issue: rust-psutil/rust-psutil#93

Alternatively we could move away from psutil entirely, the main competitor seems to be heim: https://crates.io/crates/heim

[AgeManning]

We might want to shift away from psutil. They don't seem to be maintaining it well and I've had to upgrade their deps again:
https://github.com/sigp/rust-psutil/tree/upgrade-deps

[AgeManning]

I've also had to fork a dep of this, which also seems to be fairly unmaintained. https://github.com/AgeManning/darwin-libproc/tree/requirements

[ackintosh]

https://github.com/GuillaumeGomez/sysinfo looks good as an alternative. 💡

I will investigate that whether there is any barrier to replace with it.

[ackintosh]

I've investigated with sysinfo v0.23.6 (latest version).

I found that some of the metrics observed in Lighthouse are not supported by sysinfo.
ref: common/eth2/src/lighthouse.rs#L197-L221

sysinfo doesn't support:

• sys_virt_mem_cached
• sys_virt_mem_buffers
• system_seconds_total
• cpu_time_total
• user_seconds_total
• iowait_seconds_total
• idle_seconds_total

work in progress (GuillaumeGomez/sysinfo#683):

• disk_node_reads_total
• disk_node_writes_total

---

I think...

sysinfo is not enough as an alternative for now, so we can't go to replace with it.
But sysinfo is still a good candidate because:

• sysinfo is more actively developed than the competitors
• sysinfo supports a number of operating systems
• the author is a contributor of the Rust ecosystem

[ackintosh]

Here is my sandbox code for the investigate. (contains Japanese comment, sorry!)