Switch to the otel runtime manager by default for self-monitoring

[swiatekm]

What does this PR do?

Why is it important?

Checklist

• I have read and understood the pull request guidelines of this project.
• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in ./changelog/fragments using the changelog tool
• I have added an integration test or an E2E test

Disruptive User Impact

How to test this PR locally

Related issues

Questions to ask yourself

• How are we going to support this in production?
• How are we going to measure its adoption?
• How are we going to debug this?
• What are the metrics I should take care of?
• ...

[mergify]

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

• backport-./d./d is the label that automatically backports to the 8./d branch. /d is the digit
• backport-active-all is the label that automatically backports to all active branches.
• backport-active-8 is the label that automatically backports to all active minor branches for the 8 major.
• backport-active-9 is the label that automatically backports to all active minor branches for the 9 major.

[elastic-sonarqube]

Quality Gate passed

Issues
0 New issues
0 Fixed issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube

[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b feat/self-monitoring-otel-default upstream/feat/self-monitoring-otel-default
git merge upstream/main
git push upstream feat/self-monitoring-otel-default

[elasticmachine]

💔 Build Failed

• Buildkite Build
• Commit: cf0a4a9

Failed CI Steps

• Win2022:sudo:fleet
• Win2022:sudo:fleet
• Win2025:sudo:fleet
• Win2025:sudo:fleet
• x86_64:sudo: upgrade
• x86_64:sudo: upgrade
• x86_64:sudo: fleet
• x86_64:sudo: fleet
• x86_64:sudo: fleet-endpoint-security
• x86_64:sudo: fleet-endpoint-security
• arm:sudo: upgrade
• arm:sudo: upgrade
• arm:sudo: fleet
• arm:sudo: fleet
• x86_64:sudo: upgrade
• x86_64:sudo: upgrade
• x86_64:sudo: fleet
• x86_64:sudo: fleet
• x86_64:sudo: fleet-endpoint-security
• x86_64:sudo: fleet-endpoint-security

History

• 💔 Build #27902 failed f4f4aee
• 💔 Build #27872 failed 58c6ae1
• 💔 Build #27815 failed 91a3eee
• 💔 Build #27747 failed ca48a67

cc @swiatekm