OpenTelemetry SDK
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    Variable METRIC_MCP_CLIENT_OPERATION_DURATIONConst Experimental

    METRIC_MCP_CLIENT_OPERATION_DURATION: "mcp.client.operation.duration" = ...

    The duration of the MCP request or notification as observed on the sender from the time it was sent until the response or ack is received.

    This metric is experimental and is subject to breaking changes in minor releases of @opentelemetry/semantic-conventions.