design-proposals: network flow observability for cozyplane - #65
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Hubble-parity L3/L4 flow verdicts, reasons, distribution metrics and DNS metrics for the cozyplane networking variant, which ships without Cilium/Hubble. Operator-only, off by default, bounded cardinality. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Signed-off-by: Loïc Fontaine <lfinmauritius@users.noreply.github.com>
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What
Adds a design proposal: network flow observability for cozyplane — Hubble-parity L3/L4 flow verdicts, reasons, distribution metrics, and DNS metrics for the
cozyplanenetworking variant.Why
A cluster running the cozyplane variant has no Cilium and no Hubble (cozyplane replaces kube-ovn + Cilium + kube-proxy). Today its datapath exposes only four aggregate counters; two of the most important drop sites are silent, and the anti-spoof drop is indistinguishable from a policy deny. This proposal fills that gap: per-flow events with a verdict and a reason (which SecurityGroup / NetworkPolicy / isolation rule), an operator CLI (
flowctl observe), bounded-cardinality Prometheus series scrapable by Prometheus and VictoriaMetrics, and DNS metrics from the resolver cozyplane already runs.Operator-only, off by default (matching Cozystack's Hubble-disabled-by-default posture), bounded cardinality, byte-identical datapath behaviour when disabled.
Scope
kubeovn-ciliumvariant), which cozyplane never coexists with.distributed-tracing(OTLP app spans, different layer) andcoroot-ebpf-observability(service-map/profiling platform) — neither can see cozyplane's policy verdicts, which live only in the CNI datapath.Requesting feedback.