Update APM Server throughput number for 8.16.0

[rubvs]

Description

The removal of Memory Pooling and the addition of PGO in 8.16.0 introduced some changes that will influence throughput. This PR updates the throughput numbers for APM Server for 8.16.0.

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 elastic/apm-server#13871 (comment)

Checklist

• Product/Engineering Review
• Writer Review

Follow-up tasks

Select one.

• 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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[mergify]

This pull request does not have a backport label. Could you fix it @rubvs? 🙏
To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-/d./d is the label to automatically backport to the /d./d branch. /d is the digit
  NOTE: backport-skip has been added to this pull request.

[bmorelli25]

Thanks, @rubvs. When you're ready, @colleenmcginnis will review and get this merged for you.

[rubvs]

Thanks, @rubvs. When you're ready, @colleenmcginnis will review and get this merged for you.

@bmorelli25 @colleenmcginnis thanks for the follow up. We are still waiting for results for AWS and Azure then I'll move it out of Draft Status

[colleenmcginnis]

Some minor suggestions below.

[rubvs]

Thank you @colleenmcginnis! I am just waiting for final approval from @simitt before we merge.

[simitt]

Thanks for the update. The only minor nit that I have is to please round the numbers to the nearest 1,000 as it was done with the old numbers. This is supposed to provide rough guidance, which we support with rounded numbers, rather than very specific ones.

[colleenmcginnis]

Feel free to merge if the build passes!