[processor/k8sattributes] Add support for extracting deployment name purely from ownerReferences

[JeffLuoo]

Component(s)

processor/k8sattributes

Is your feature request related to a problem? Please describe.

Potential high load on api server if users deploy the collector as a daemonset on a large cluster

Describe the solution you'd like

With the feature, the collector doesn't need to start a informer to fetch the deployment name related to the pod. Instead, it extracts the deployment name from the ownerReferences by trimming down the pod template hash.

Describe alternatives you've considered

No response

Additional context

No response

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[github-actions]

Pinging code owners:

• processor/k8sattributes: @dmitryax @fatsheep9146 @TylerHelmuth @ChrsMark

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[odubajDT]

Agree that it's not needed to fetch Deployment, since ReplicaSet already has the information about the Deployment name. We should just make sure, that the ReplicaSet is not standalone, therefore it has an owner (e.g. Deployment). Therefore checking the owners of the ReplicaSet is necessary.

[dashpole]

@odubajDT I believe @JeffLuoo wants to avoid fetching the ReplicaSet entirely to reduce load on the APIServer when the collector is a daemonset. In larger clusters, watching replicasets from a daemonset produces O(nodes * replicasets) load on the APIServer, which isn't viable. Watching pods from a daemonset is alright as long as the daemonset only watches pods on its own node, with O(pods) total load on the APIServer.

I don't think we will be able to verify that the owner of the ReplicaSet is a Deployment if we go that route. We can still verify that the replicaset name has the correct suffix for a deployment-owned replicaset. This heuristic is used by Google Managed Prometheus, and has worked reliably.