routenator and krill log filter

i get nightly log reportd from rpki servers of various flavors. two, see $ubject, seem to be popular enough that others may have tooling to help. for each, i want log filters/analysers which tell me about bad things i can do something about. i do not care about the 42,000 sick servers out there as i do not have time to fix the world. i do not care about things not needing action on *my* part. i expect/hope for a null report most days. i do not want a fully featured blob, a gooey, a large wad of dependencies, ... just something stupid i can pipe the logs through old fashioned unix style. randy