src/vs/workbench/contrib/output/common/outputChannelModel.ts/OutputFileListener/doWatch
class OutputFileListener:	private async doWatch(): Promise<void> {
		const stat = await this.fileService.stat(this.file);
		if (stat.etag !== this.etag) {
			this.etag = stat.etag;
			this._onDidContentChange.fire(stat.size);
		}
	}