call out to fio for host filesystem performance

[adamancini]

Description, Motivation and Context

Shell out to the fio utility to collect filesystem write latency info instead of using the old method of writing to disk directly. Work in some additional types to support using any of the metrics that fio returns in future analyzers.

#1215

Checklist

• New and existing tests pass locally with introduced changes.
• Tests for the changes have been added (for bug fixes / features)
• The commit message(s) are informative and highlight any breaking changes
• Any documentation required has been added/updated. For changes to https://troubleshoot.sh/ create a PR here
  Update filesystemPerformance.md for fio binary troubleshoot.sh#519

Does this PR introduce a breaking change?

• Yes
• No

the collector will require the installation of the fio binary. If fio is not installed, the collector will fail to run and print an error, similarly to our other collectors that require userspace utilities to be installed.

[xavpaice]

can we get a description in the PR for what this is doing exactly, and fix up the merge conflicts? I'm hoping that'll trigger the tests to run.

We are going to need to get some testing into this PR to be able to approve it.

I like the approach, makes sense to me and will produce much more accurate results.

[adamancini]

ok, tests should finally run, fixed up go.mod problems, @xavpaice ack on the test coverage

[adamancini]

replicatedhq/troubleshoot.sh#519 docs

[adamancini]

added some code to handle permission errors gracefully:

ada@ada-kurl:~$ ./support-bundle sample-troubleshoot.yaml

 * failed to run host collector: filesystem-latency-two-minute-benchmark-background-iops-off: open /var/lib/etcd/fsperf permission denied.  Please run this collector as root.: open /var/lib/etcd/fsperf: permission denied


support-bundle-2023-09-06T20_09_26.tar.gz

[banjoh]

Changes look good. I ran some tests using both preflight and support-bundle binaries.

I made a few minor comments to improve the code

[adamancini]

merged main, updated collector tests, ready for re-re-review

mm tests are failing, have to fix something

[banjoh]

Changes look good overall. I added a few comments, but nothing that would affect the structure of the PR too much.

[banjoh]

Ship it 🚀