Port #4341 to stateful docs: Add new page on inventory

[alaudazzi]

Description

This PR adds a new page on Inventory (port #4341 to stateful docs).

Documentation sets edited in this PR

Check all that apply.

• Stateful (docs/en/observability/*)
• Serverless (docs/en/serverless/*)
• Integrations Developer Guide (docs/en/integrations/*)
• None of the above

Related issue

Closes #4348

Checklist

• Product/Engineering Review
• Writer Review

Follow-up tasks

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None apply, as this PR ports content from serverless to stateful.

• This PR does not need to be ported to another doc set because:
  • The concepts in this PR only apply to one doc set (serverless or stateful)
  • The PR contains edits to both doc sets (serverless and stateful)
• This PR needs to be ported to another doc set:
  • Port to stateful docs: <link to PR or tracking issue>
  • Port to serverless docs: <link to PR or tracking issue>

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[alaudazzi]

In the new Observability doc structure for 8.16, I've added the new Inventory page here:

@roshan-elastic If you have other preferences, please let me know.

[dedemorton]

Just some minor things, otherwise LGTM. Thanks!

[alaudazzi]

@dedemorton
The screenshots seem to be OK (at least from the local preview).
One question: I'm a bit confused about how the index is generated for the APM section. I thought I added the new Inventory page as described here, on the apm-view-and-analyze-data page:

include::{observability-docs-root}/docs/en/observability/apm/view-and-analyze/ui-overview/index.asciidoc[leveloffset=+1]
include::{observability-docs-root}/docs/en/observability/apm/view-and-analyze/inventory.asciidoc[leveloffset=+1]
include::{observability-docs-root}/docs/en/observability/apm/view-and-analyze/drill-down/index.asciidoc[leveloffset=+1]
include::{observability-docs-root}/docs/en/observability/apm/view-and-analyze/filter-and-search/index.asciidoc[leveloffset=+1]
include::{observability-docs-root}/docs/en/observability/apm/view-and-analyze/interpret/index.asciidoc[leveloffset=+1]
include::{observability-docs-root}/docs/en/observability/apm/view-and-analyze/machine-learning.asciidoc[leveloffset=+1]
include::{observability-docs-root}/docs/en/observability/apm/view-and-analyze/agent-explorer.asciidoc[leveloffset=+1]
include::{observability-docs-root}/docs/en/observability/apm/view-and-analyze/settings.asciidoc[leveloffset=+1]

but this is not appearing in the TOC

[dedemorton]

but this is not appearing in the TOC

Edit: The problem is that you are looking at the wrong branch. Try navigating to the preview through the diff link so that you don't accidentally get dumped into the wrong branch from the landing page.

Maybe it's a caching issues? Or maybe you got into the wrong branch by mistake and aren't looking at the preview? I can see the TOC entry here:

https://observability-docs_bk_4438.docs-preview.app.elstc.co/guide/en/observability/master/inventory.html

[dedemorton]

The screenshots seem to be OK (at least from the local preview).

I'm looking at your screenshots in the PR and they don't match what I see in the new navigation for 8.16 (see below). I'm looking at the latest snapshot build. But regardless, we should avoid including navigation in screen captures because it'll differ in 8.16 depending on whether users are looking at the new solution-based navigation or the "classic" navigation. The easy fix here is to just crop the page so that you don't show the navigation pane in the screenshot.

[alaudazzi]

@dedemorton
Images are now cropped and no longer display the nav pane. It would be great if you could have a final look and approve! Thanks for your thorough review!

[dedemorton]

LGTM!