I know it's a rarity for them, but I do wish Google would post when there's a big lag in their reports like they did last month.
Against a red background at the top of my AdSense reports I'm seeing "We're sorry, some data in this report is delayed, please try again later. There's no impact to ad serving or payments."
I think that was the one and ONLY time I've seen such a notification in the nine years I've been with the program. It was nice knowing for once that the problem was not on my end, actually reassuring. Unfortunately, now when there's a big lag and they DON'T report it I'm back to wondering why.