Equip node with process-exporter

[xemul]

Node exporter exports data for the whole node, but we're in many cases interested in data about individual process, namely -- scylla daemon. There's process exporter project that should help us with it

[xemul]

Example: number of open files. Scylla doesn't have this metrics natively. Node-exporter exports it for the whole node including all other processes.
Similar example: number of open sockets. If process exporter tells sockets from other files, that'd be awesome

[xemul]

Another example: user/system/idle time consumption ratio. Idle is probably going to be zero, but u/s ration is interesting

[mykaul]

But we do run in Scylla Cloud node exporter. Perhaps it's missing in Enterprise / OSS?

[xemul]

The request is not about node exporter, but about process exporter to export metrics about individual scylla daemon, not the whole node it runs on

[amnonh]

@xemul Please open the issue in the right repository

[xemul]

@amnonh , what's the right repository for this issue?

[amnonh]

@xemul Scylla monitoring is just for monitoring; this issue is either in Scylla's repository (if it's something that always needs to be installed) or the cloud if it's cloud-specific.

[xemul]

Likely we'll need new dashboards for this exporter and from a quick look I didn't find those in exporter repo, only the link to an example. Presumably this issue should be kept open due to that, but feel free to close it if you think it should not