michal/observer/fix-zero-fault-issue-in-etop-suite

[Mikaka27]

This caused issue in our zerofault CI suite: https://github.com/erlang/backlog/issues/701

[github-actions]

CT Test Results

  2 files   15 suites   7m 27s ⏱️
164 tests 160 ✅ 4 💤 0 ❌
181 runs  177 ✅ 4 💤 0 ❌

Results for commit 75014bc.

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Artifacts

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// Erlang/OTP Github Action Bot

[Mikaka27]

Changed to draft for now since it caused failure in the CI, need to investigate more.

[Copilot]

Pull Request Overview

This PR fixes a race condition in the etop module's stop functionality that was causing issues in the zerofault CI suite. The changes ensure proper synchronization when stopping etop processes by monitoring them and waiting for their termination.

• Replaces fire-and-forget message sending with proper process monitoring
• Ensures reader process termination is properly awaited before continuing
• Adds defensive checks for process aliveness before attempting to stop them

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