[Hawkular-dev] Availability metrics: aggregate stats series

Hello all, I'm still aiming to add some features to the grafana plugin. I've started to integrate availabilities, but now I'm facing a problem when it comes to show aggregated availabilities ; for example think about an OpenShift pod that is scaled up to several instances. Since availability is basically "up" or "down" (or, to simplify with the other states such as "unknown", say it's either "up" or "non-up"), I propose to add this new feature: availability stats with aggregation. The call would be parameterized with an aggregation method, which would be either "all of" or "any of": with "all of" we consider that the aggregated series is UP when all its parts are UP. It would require a new endpoint since the AvailabilityHandler currently only expose stats queries with metric id as query parameter - not suitable for multiple metrics. Any objection or remark for this feature? Joel