Describe Satellite usage metrics collection

[aneta-petrova]

What changes are you introducing?

Adding explanation on Satellite's usage metrics collection.

Why are you introducing these changes? (Explanation, links to references, issues, etc.)

theforeman/foreman_maintain#851

Anything else to add? (Considerations, potential downsides, alternative solutions you have explored, etc.)

Because this is specific to Satellite, I'm not using the usual attributes, such as {Team} or {foreman-maintain}, and I'm instead hard-coding them as Red{nbsp}Hat and satellite-maintain.

Checklists

• I am okay with my commits getting squashed when you merge this PR.
• I am familiar with the contributing guidelines.

Please cherry-pick my commits into:

• Foreman 3.14/Katello 4.16
• Foreman 3.13/Katello 4.15 (EL9 only)
• Foreman 3.12/Katello 4.14 (Satellite 6.16; orcharhino 7.2 on EL9 only)
• Foreman 3.11/Katello 4.13 (orcharhino 6.11 on EL8 only; orcharhino 7.0 on EL8+EL9; orcharhino 7.1 with Leapp)
• Foreman 3.10/Katello 4.12
• Foreman 3.9/Katello 4.11 (Satellite 6.15; orcharhino 6.8/6.9/6.10)
• Foreman 3.8/Katello 4.10
• Foreman 3.7/Katello 4.9 (Satellite 6.14)
• We do not accept PRs for Foreman older than 3.7.

[aneta-petrova]

Hi @adamruzicka, can you please review when you're available?

[github-actions]

The PR preview for 62d726d is available at theforeman-foreman-documentation-preview-pr-3846.surge.sh

The following output files are affected by this PR:

• Planning_for_Project/index-satellite.html

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show diff as HTML

[aneta-petrova]

Hi @Lennonka, what do you think about the placement? Is Planning guide a good place to add this?

[adamruzicka]

Two optional suggestions, otherwise looks good