add procps, vnstat, linux-tools

[emranemran]

• procps so we upgrade the version of top running on our pods and get access to better info.
• vnstat so we can do bandwidth calcs in catabalancer
• linux-tools so we can have perf by default in the pods which have been useful for flamegraphs (cc @victorges)

[iameli]

Sure but you can't rely on it being there any time soon, we don't roll pods much. What would you think of using this in catalyst-api instead? We're going to need something like it for the load balancing work. https://github.com/cloudfoundry/gosigar

[iameli]

@emranemran Do we still need this with all the system monitoring stuff landing in catabalancer?

[emranemran]

@emranemran Do we still need this with all the system monitoring stuff landing in catabalancer?

yes! this helps with per-process cpu/mem usage during specific operations in catalyst-api and the inter-parsing of these logs with catalyst-api helps narrow down issues quicker.

[emranemran]

hmm do we think we don't need to reference it by kernel version?

3.894 Reading state information...
3.913 3 packages can be upgraded. Run 'apt list --upgradable' to see them.
3.927 
3.928 WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
3.928 
: Couldn't find any package by glob 'linux-tools-5.4.0-148-generic'

``` 

[hjpotter92]

linux-tools-generic alone should be enough. it should pick up correct linux-tools-<version>-generic based on installed kernel version.

[emranemran]

Got it, updating.

[iameli]

sure

[iameli]

Tests failing though, you. should rebase