Add UpDownCounter metric type to OTEL server API

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    • Type: Task
    • Resolution: Fixed
    • Priority: Major - P3
    • 9.0.0-rc0
    • Affects Version/s: None
    • Component/s: None
    • Networking & Observability
    • Fully Compatible
    • N&O 2026-03-30
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      Currently, server API for adding new OTEL metrics offers counter, gauge and histogram metric types. We also need UpDownCounter metric type.

      A known use-case from SPM-4498 project: we need to report the number of currently open and currently pinned cursors. The metric can be easily updated from ClientCursor and CursorPin classes by adding 1 on construction and subtrating1 on destruction.

        1.
        		 Introduce MetricsUpdownCounter class SERVER-122661 Sub-task Closed Cheahuychou Mao 9.0.0-rc0
        2.
        		 Make MetricsService support UpDownCounter SERVER-122663 Sub-task Closed Cheahuychou Mao 9.0.0-rc0
        3.
        		 Make OtelMetricsCapturer support UpDownCounter SERVER-122664 Sub-task Closed Cheahuychou Mao 9.0.0-rc0
        4.
        		 Document UpDownCounter metric type SERVER-122675 Sub-task Closed Cheahuychou Mao 9.0.0-rc0

            Assignee:
            Cheahuychou Mao
            Reporter:
            Romans Kasperovics
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              Created:
              Updated:
              Resolved: