We already have some tools that process samples captured by pt-stalk: pt-diskstats, pt-mext, pt-sift, and it would be great to be able to summarize/aggregate the SHOW FULL PROCESSLIST samples collected by it.  In fact pt-query-digest already knows how to parse SHOW PROCESSLIST samples, but it only takes input by polling directly from the server, so this feature request is to extend the functionality so it can process the output already polled by pt-stalk.