src/vs/workbench/contrib/notebook/browser/view/renderers/cellRenderer.ts/CodeCellRenderer/updateExecutionOrder
class CodeCellRenderer:	private updateExecutionOrder(internalMetadata: NotebookCellInternalMetadata, templateData: CodeCellRenderTemplate): void {
		if (this.notebookEditor.activeKernel?.implementsExecutionOrder) {
			const executionOrderLabel = typeof internalMetadata.executionOrder === 'number' ?
				`[${internalMetadata.executionOrder}]` :
				'[ ]';
			templateData.executionOrderLabel.innerText = executionOrderLabel;
		} else {
			templateData.executionOrderLabel.innerText = '';
		}
	}