[Hawkular-dev] Availability metrics: aggregate stats series

[John Sanda]

I like the idea of aggregated availabilities, but I don’t know that it can easily be simplified to up/down. Let’s say we have 3 Cassandra nodes deployed with replication_factor = 1.  If one node goes down we are at 66% availability.

> On Aug 29, 2016, at 3:24 AM, Joel Takvorian <jtakvori at redhat.com> wrote:
> 
> 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
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