Group by Knative Service

[fabiob]

Hi! I'm using KRR for a few weeks now and it is helping me a lot! I'm even evaluating Robusta right now.

There's something I would like it to support, though: we use Knative for a lot of services, but the Knative Serving works by wrapping Kubernetes Deployments into Revisions. In practice, it means that for every change we make to the service, it creates a new Kubernetes Deployment to replace the previous.

Since KRR groups pods by either Statefulset or Deployment, it means the KRR recommendations are not grouped properly. I would love to see KRR grouping the pods by Knative Service when available.

If that's not possible, at least let me write some kind of transformation pattern on the grouping name: for Knative Services, we would just need to remove the -\d+-deployment$ suffix from the deployment name, and the grouping would be correct.

Thanks in advance!

[aantn]

Hi @fabiob, this is interesting - thank you! I hadn't known KNative grouped Deployments like that.

We don't have builtin support for this, but we're open to solutions that address it. Do you want to use data across different revisions in the same calculations, or should each revision's data be calculated standalone and you just transform the latest one into a standard name? (The latter is likely the easier approach as its a transformation at the end of the pipeline.)

What are you evaluating in Robusta? Is it mostly the KRR functionality or also HolmesGPT?

[fabiob]

In a perfect world, I would like to have something like this on KRR:

I think KRR can work best if it is able to group all the revisions into a single unit for recommendation purposes, so I was thinking on grouping pods by Knative Service when available (detectable by reading the pod label serving.knative.dev/service), otherwise keep the current model.

But any improvement would be very nice.

[aantn]

Thank you, that makes sense! I don't have an ETA right now, this helps us plan what a good solution looks like.

[Avi-Robusta]

Hi @fabiob ,
I implemented something similar for Grouping jobs by specific labels, here is the PR incase you are interested in opening a PR for your feature.
#478