kube-state-metrics
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kubernetes
feat: Use PartialObjectMetadata for Configmaps
What this PR does / why we need it: This PR introduces a metadataonly client, which can be used to fetch sparse data for large objects like configmaps.
How does this change affect the cardinality of KSM: (increases, decreases or does not change cardinality) None
Which issue(s) this PR fixes (optional, in fixes #<issue number>(, fixes #<issue_number>, ...) format, will close the issue(s) when PR gets merged):
Fixes https://github.com/kubernetes/kube-state-metrics/issues/2463
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We can't use partialobjectmetadata for secrets unfortunately, since we have metrics for the secrets type that we expose.
We can't use partialobjectmetadata for secrets unfortunately, since we have metrics for the secrets type that we expose.
Secret supports type as a field selector.
I wonder if we could make a sort of informer that does a metadata-only watch per known Secret type, plus one that watches for unknown types and doesn't use partial object metadata. Should be quite a bit more efficient overall, at the cost of turning one watch into n.
I still lack seeing the hoped memory improvements with this PR. My test looks like the following (creates 100x 1MB sized configmaps):
for i in $(seq 1 100); do
base64 /dev/urandom | head -c 1000000 > file.txt
kubectl create configmap morecm$i --from-file="file.txt"
done
Few comments, but I am a fan of this change! :)
Great to hear! I'm still looking for better ideas to verify that it saves network traffic and reduces memory consumption on ksm.
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PR needs rebase.
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