Librato founder and current Solarwinds employee here. Happy to answer any questions. Important to note that AppOptics is effectively a proper superset of Librato, internally it's powered by the same infrastructure and is API-compatible with Librato's newer "multidimensional" (i.e. tagging) data model that we launched just over a year ago. The "superset" is a huge swath of new capabilities per the email above.