src/vs/workbench/contrib/remote/browser/tunnelView.ts/TunnelItem/iconTooltip
class TunnelItem:	get iconTooltip(): string {
		const isAdd = this.tunnelType === TunnelType.Add;
		if (!isAdd) {
			return `${this.processDescription ? nls.localize('tunnel.iconColumn.running', "Port has running process.") :
				nls.localize('tunnel.iconColumn.notRunning', "No running process.")}`;
		} else {
			return this.label;
		}
	}