Or (in more pragmatic and plainer terms) it's a way of seeing that there isn't a huge gap or disjunction in the data due to some IT related event such as a data

Or (in more pragmatic and plainer terms) it's a way of seeing that there isn't a huge gap or disjunction in the data due to some IT related event such as a data migration, someone introducing a bug into the feed that's been unnoticed or a deeper failure in the sensors that are providing the data.