(calling `Instances.set_reachable/1` only if instance had `unreachable_since`, calling `Instances.set_unreachable/1` only if instance had nil `unreachable_since`).  | 
			||
|---|---|---|
| .. | ||
| instance.ex | ||
				(calling `Instances.set_reachable/1` only if instance had `unreachable_since`, calling `Instances.set_unreachable/1` only if instance had nil `unreachable_since`).  | 
			||
|---|---|---|
| .. | ||
| instance.ex | ||