Allow "Kubernetes-Style" labels for aggregation

[michaelharrer]

When I try to aggregate on an annotation or label in this format:

labels:
  app/name: "appname"
  helm/release: "releasename"

the bucketaggregation will fail due to the char /
Seems like it is a problem with ES client library.

[Zandrael]

thx for this issue report

Regarding to the official documation for k8s labels (https://kubernetes.io/docs/concepts/overview/working-with-objects/common-labels/), there are officially recommended k8s labels like "app.kubernetes.io/name". So it would be awesome, if elcep could support them.

currently we have to add additional non prefixed labels as workaround, which results in some terrible redundancy, like that:

helm/release: "release-name"
release: "release-name"
app/name: "app-name"
app: "app-name"

[RafalMaleska]

Will this issue be included in the backlog for the upcoming releases?