mirrorReads server parameter resets fields that aren't supplied in setParameter

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    • Type: Bug
    • Resolution: Unresolved
    • Priority: Major - P3
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    • Affects Version/s: None
    • Component/s: None
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    • Networking & Observability
    • ALL
    • N&O 2025-07-07, N&O 2025-08-04, N&O 2025-08-18, N&O 2025-09-01, N&O 2025-09-15
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      Example:

      db.adminCommand({ setParameter: 1, mirrorReads: {samplingRate: 1, maxTimeMS: 4}})
      db.adminCommand({ setParameter: 1, mirrorReads: {maxTimeMS: 10}})
      
      // This outputs {samplingRate: 0.01, maxTimeMS: 10}
      db.adminCommand({ getParameter: 1, mirrorReads: 1})

      We should update this to either guarantee that a setParameter on mirrorReads must include all fields or add some logic to not overwrite the already existing fields.

            Assignee:
            Unassigned
            Reporter:
            Joseph Prince
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              Created:
              Updated: