Support exporting from deployed manifests

[maximilianbraun]

Cheers,

i was wondering if you see the following feature as something valuable for fluxcd.

The overarching problem is to either extract or pass data from one deployment to another.
Given would be a scenario like this: I have one management cluster running fluxcd [m], and cluster [a],[b] which have deployments ([a1] and [b1]) which are managed by this fluxcd instances.
[a1] exposes a loadbalancer with an Ip which is relevant for [b1], lets just say we need the IP in the deploymentss [b1].

My idea would be to have a feature, similar to what exists in https://github.com/crossplane-contrib/provider-helm/blob/master/examples/sample/release.yaml#L38-L65 where we can define some kind of exports on the HelmRelease or Kustomization and later use that data in another HelmRelease or Kustomization. One other problem scope could be the modification of that data.

WDYT? is that soemthing you'd see in FluxCD?