[Infra UI] Update Host Disk Partition Average Metrics to 'max'

[roshan-elastic]

Background

Users want to understand if a disk on a host is running out. Currently, we show the 'average' disk partition space across all partitions (mount points) on a host - this is meaningless as is disguises any partitions which run out of space

Description

Update two visualisations to use 'max' instead of 'average' partition space to ensure any partitions which are high will be apparent in the UI.

Note : See imminently related issue:

• https://github.com/elastic/observability-dev/issues/3311

Related Issues

• https://github.com/elastic/enhancements/issues/20915
• [Infra UI] : Enhanced Disk Space Support for Hosts #164151

Solution

1. Update Disk Usage KPI Tile to use 'max' in Hosts List

New formulae
max(system.filesystem.used.pct)

New name
Disk Usage (Max)...see below

Updated tooltip

Maximum usage of any partition across all hosts.

Formula Calculation:
max(system.filesystem.used.pct)

2. Update Disk Usage in table to 'max' in Hosts List

New formulae
max(system.filesystem.used.pct)

New name
Disk Usage (max.)

Updated tooltip

Maximum percentage of disk space used across all partitions per host.

Formula Calculation:
max(system.filesystem.used.pct)

See documentation(opens in a new tab or window) for more information.

3. Remove Disk Usage in visualisation in fly-out and detail view

This chart isn't that helpful - the existing disk usage by mount-point is more helpful so removing this to reduce confusion.

[roshan-elastic]

@smith - This should be a quick win - it's just lens config and will fix the following ER:

• https://github.com/elastic/enhancements/issues/20915

Where's best to put this? Would be great to get this done as a snack!

cc @herrBez

[elasticmachine]

Pinging @elastic/obs-ux-infra_services-team (Team:obs-ux-infra_services)

[jennypavlova]

Hey @roshan-elastic,
I have a couple of questions:

• The disk usage by mount point chart should remain unchanged right? (still using the average formula)

Regarding 3.:

• What should we show instead of the chart in asset details full page view? (we will have a 'free' space when the chart is removed) or we will leave it like that?

• It looks fine in the flyout view as we already have an odd chart count:
  

---

• Should we remove the chart from the hosts view (list view) as well as the asset details flyout/page view?

  • If yes, this is the chart(s) we need to remove right?
  
  • So not the Disk space available on the hosts view (list view):
  

---

• The Docs should be updated as well right? https://www.elastic.co/guide/en/observability/current/host-metrics.html

[roshan-elastic]

Hey @jennypavlova - thanks for this!

The disk usage by mount point chart should remain unchanged right? (still using the average formula)

👍

What should we show instead of the chart in asset details full page view? (we will have a 'free' space when the chart is removed) or we will leave it like that?

Quick Q - how does this question play out if you look at the parent issue?

Should we remove the chart from the hosts view (list view) as well as the asset details flyout/page view?

Good catch - yeah, let's remove it.

The Docs should be updated as well right?

Yeahhhhh :( I'll add it to my list...

[jennypavlova]

Quick Q - how does this question play out if you look at the https://github.com/elastic/observability-dev/issues/3311?

@roshan-elastic Thank you for your reply! I saw that there will be changes in the charts we show in the metrics tab and the overview tab, I guess this space won't be an issue for now (as it will change anyway) so we can go with this change, I think and remove the Disk Usage chart everywhere.

[jennypavlova]

Hey @roshan-elastic, FYI this change will be available in 8.14 so it will be good to have the docs ready as well for the version release.

[roshan-elastic]

Cheers @jennypavlova - question, will the metrics tab be available as well?

[jennypavlova]

will the metrics tab be available as well?

@roshan-elastic If we close this issue (#175446) before FF it will be available. Does it matter for the docs changes related to this issue? I am not familiar with how the changes in the docs work - can it be that we have 2 separate changes or do they update the docs once per release?

[roshan-elastic]

Hey @jennypavlova - I believe they update docs as part of the release cycle too but they typically do this considerably past FF.

Thinking maybe we wait to know if we'll be doing the metrics tab in 8.14 and then I can file a single docs request?

[roshan-elastic]

@jennypavlova - FYI created a docs issue:

• [Request]: Updated Disk Metrics in Host List observability-docs#3793

[jennypavlova]

@roshan-elastic Thank you for opening the request! BTW the metrics tab PR is also merged and it will be part of the 8.14 release