[Hawkular-dev] APM - lost requests ?

How do we explain the drops in requests in the following example: http://www.hawkular.org/img/blog/2017/2017-02-13-teaser.png Shouldn't it always be the same load ? Do we know if it's an it's an issue in APM, or is it that the load balancing "lose" some requests as we scale down a server ? or else ? Thomas