l <a href="//nightlies.apache.org/flink/flink-docs-release-1.11/dev/stream/operators/windows.html">Window
API</a>
that is applicable for a wide range of use cases. However, if you go
over all of the available types of supported windows, you will realize
that none of them exactly match our main requirement for this use case -
the low-latency evaluation of <em>each</em> incoming transaction. There is
no type of window in Flink that can express the <em>&ldquo;x minutes/hours/days
back from the <u>current event