Not sure if someone raised that question before, if they did, sorry then.

In case when calculated item contains one (ore more) last() function, it isn't working properly because:

• if host is unavailable, and we have some history for item, last() won't be accurate
• if host was never available, and we have no history for item – last() will return an error
  In both cases calculated item will be not supported.

My point is that we should have an ability to stop gather data until all items are fine and working properly.

Right now it can be filled with an old data or be not supported – both situations are not good.