Stone.js API
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    SERVER_ERROR_STATUS: 500

    HTTP status code at or above which a server response is considered an error.

    Follows the OpenTelemetry HTTP semantic conventions: for a server span, only 5xx responses set the span status to error; 4xx are client errors and leave the status ok. Responses without a status code (e.g. CLI/other adapters) are treated as ok unless the handler throws.