Support multi tenancy

[gklijs]

Enhancement Description

Support multi tenancy applications better

Current Behaviour

A lot of information is missing, for example the serializer. Likely all the statistics are also combined.

Wanted Behaviour

Everything works well with multi-tanency. I'm not sure how far we should go. I can imagine it would be great if metrics are per tenant, this would also increase handler count. And if alerts can be set per tennant. Ideally we could add features like 'remove all data from this tenant'. It's a slippery scope and doing this fully also requires changes to other services, like console-web and console-monitoring likely.

Possible Workarounds

Leave it how it is, but it creates a bad impression, minimally we should add the serializer property, which should be easy with some reflection magic.