accessing
viewInstancesFor: aView
	<gtView>
	| columnedList columnNames |
	self instances isEmptyOrNil ifTrue: [ ^ aView empty].
	columnedList := aView columnedList
		title: 'Instances';
		items: [ self instanceRows ];
		priority: 1.
	columnNames := #('Instance' 'Healthy' 'Uptime %' 'RSS' 'Nitter Version').
	columnNames doWithIndex: [:aName :index | 
		columnedList 
			column: aName 
			text: [:instanceRow | (instanceRow at: index) ifNil: [''] ] 
	].
	^ columnedList