promdump dumps the head and persistent blocks of Prometheus. It supports filtering the persistent blocks by time range. When debugging Kubernetes clusters, I often find it helpful to get access to the in-cluster Prometheus metrics. Since it is unlikely the users will grant me direct access to their Prometheus instancs, I have to ask them to export the data. To reduce the amount of back-and-forth with the users (due to missing metrics, incorrect labels etc.), it makes sense to ask the users to "get me everything around the time of the incident".