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[ci skip] Document `ActiveSupport::Subscriber` in guides

Rodrigo Muino Tomonari requested to merge github/fork/heka1024/active-support-subscribers-doc into main

Created by: heka1024

Motivation / Background

ActiveSupport::Subscriber provides a nice way to handle ActiveSupport::Notifications::Event. However, there is a lack of guide.

Detail

Document how to subscribe event of given namespace using ActiveSupport::Subscriber.

Additional information

Checklist

Before submitting the PR make sure the following are checked:

  • This Pull Request is related to one change. Unrelated changes should be opened in separate PRs.
  • Commit message has a detailed description of what changed and why. If this PR fixes a related issue include it in the commit message. Ex: [Fix #issue-number]
  • Tests are added or updated if you fix a bug or add a feature.
  • CHANGELOG files are updated for the changed libraries if there is a behavior change or additional feature. Minor bug fixes and documentation changes should not be included.

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