[Fleet] Readme improvements

[criamico]

Summary

Related to #163570

Add a section to Readme about option to provide a default version for API headers.

[elasticmachine]

Pinging @elastic/fleet (Team:Fleet)

[ghost]

🤖 GitHub comments

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Just comment with:

• /oblt-deploy : Deploy a Kibana instance using the Observability test environments.
• /oblt-deploy-serverless : Deploy a serverless Kibana instance using the Observability test environments.
• run elasticsearch-ci/docs : Re-trigger the docs validation. (use unformatted text in the comment!)

[criamico]

@elasticmachine merge upstream

[kibana-ci]

💔 Build Failed

• Buildkite Build
• Commit: e4006f0
• Interpreting CI Failures

Failed CI Steps

• Serverless Observability Examples Tests
• Serverless Security Cypress Tests #3
• Serverless Security Cypress Tests #5
• Serverless Security Investigations Cypress Tests #1
• Serverless Security Investigations Cypress Tests #5
• Fleet Cypress Tests

Test Failures

• [job] [logs] Serverless Security Investigations Cypress Tests #5 / Basic discover search and filter operations "before each" hook for "should change data when dataView is changed" "before each" hook for "should change data when dataView is changed"
• [job] [logs] Serverless Security Cypress Tests #3 / Display not found page "before each" hook for "navigates to the exceptions page with incorrect link" "before each" hook for "navigates to the exceptions page with incorrect link"
• [job] [logs] Serverless Observability Examples Tests / serverless examples UI Unified Field List Examples Field stats field distribution "before all" hook for "should return an auto histogram for numbers and top values"
• [job] [logs] Serverless Security Investigations Cypress Tests #1 / Timeline Templates Create template from timeline Create template from timeline
• [job] [logs] Fleet Cypress Tests / When the user has All privilege for Fleet but Read for integrations Integrations are visible but cannot be added
• [job] [logs] Fleet Cypress Tests / When the user has All privileges for Integrations but None for for Fleet Integrations are visible but cannot be added
• [job] [logs] Fleet Cypress Tests / When the user has Editor built-in role Integrations app are visible and can be added
• [job] [logs] Fleet Cypress Tests / When the user has Viewer built-in role Integrations are visible but cannot be added

Metrics [docs]

✅ unchanged

History

• 💔 Build #156840 failed 9685b57

To update your PR or re-run it, just comment with:
@elasticmachine merge upstream

cc @criamico