Watch configmap not owned by CR and in a diff namespace

[pbikki]

I'm looking for a way to send a reconcile request to my custom resource (CR) controller when there is an update to a centralized config map (not owned by CR) and located in a different namespace.

Note: I don't have a reference to the the config map in my CR spec. But I do know where the configmap is. Wondering how I can watch just this specific resource

From the docs, https://book.kubebuilder.io/reference/watching-resources/externally-managed.html
I see that we can achieve something like this by setting up a watch on in the SetupWithManager. However I'm not sure how can we achieve this when CR and configmap are in different namespaces and when I don't have a reference to the configmap in my CR

[FillZpp]

@poojitha-bikki You can watch configmaps with your custom handler, in which you find the CR that should be triggered by this changed configmap and put the CR request into workqueue.

[camilamacedo86]

Closing this one
However, if you see that is required please feel free to reopen