Support team based notifications based on deployments

[nabadger]

Typically we have sites that are owned by teams, and those teams have their own flowdock (or slack) channels.

We already have notifications (alertmanager) sent (routed) to specific teams based on labels on the Deployment, for example:

labels:
 app.kubernetes.io/owner: cluster-ops

These should probably be annotations instead ;)

It would be nice to have kube-lookout be able to notify different slack channels based on such annotations.

It's probably risky to have slack tokens inside the deployment as an annotation, so it could be that kube-lookout keeps a configuration (a map) of owners to slack channel tokens (or flowdock etc).