One park's upstream snapshot time, as the source itself states it.
observedAt is the instant the source says its snapshot describes (a feed's
own generation stamp). readAt is when this destination read that snapshot.
readAt - observedAt is how old the upstream data already was when it was
collected: a source that has stopped refreshing but keeps answering shows up
here and nowhere else.
One park's upstream snapshot time, as the source itself states it.
observedAtis the instant the source says its snapshot describes (a feed's own generation stamp).readAtis when this destination read that snapshot.readAt - observedAtis how old the upstream data already was when it was collected: a source that has stopped refreshing but keeps answering shows up here and nowhere else.