Clarify export behavior of diagnostic settings

[didiergbenou-ms]

This behavior makes sense but one of my customers was confused about it. Noticed we do not have a current statement on our docs for this.

[prmerger-automator]

@didiergbenou-ms : Thanks for your contribution! The author(s) and reviewer(s) have been notified to review your proposed change.

[learn-build-service-prod]

Learn Build status updates of commit 76ad271:

✅ Validation status: passed

File	Status	Preview URL	Details
articles/azure-monitor/platform/diagnostic-settings.md	✅Succeeded

For more details, please refer to the build report.

[ttorble]

@bwren

Can you review the proposed changes?

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#label:"aq-pr-triaged"
@MicrosoftDocs/public-repo-pr-review-team

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[Copilot]

Pull Request Overview

This PR adds clarification about the export behavior of diagnostic settings in Azure Monitor documentation. The purpose is to address customer confusion by explicitly documenting that diagnostic settings only export data generated after they are enabled.

• Added a note section explaining that diagnostic settings only export data created after enablement
• Clarified that historical data before configuration is not exported
• Included guidance to enable settings early to capture necessary logs

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[v-dirichards]

@bwren

Can you review this old PR and determine whether it needs to be closed or merged?

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