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OpenCost is a CNCF project for Kubernetes cost monitoring. It combines cloud or configured pricing with Kubernetes resource allocation and exposes the results as Prometheus metrics. Radar discovers OpenCost data through the already-connected Prometheus. No OpenCost CRDs or additional Radar configuration are required. The integration is passive and read-only.

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What Radar shows

  • Current cluster rate and monthly projection.
  • CPU, memory, storage, and network cost when present.
  • Namespace and node breakdowns.
  • Focused application and workload CPU and memory allocation cost.
  • Historical 6h, 24h, and 7d trends with hover details.
  • Separate CPU and memory allocation-use evidence when usage coverage is complete.
See Cost insights for the user-facing views and current scope.

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Prerequisites

OpenCost or Kubecost must be deployed and its metrics must be scraped by Prometheus. Missing provider pricing or allocation metrics appear as unavailable rather than zero.

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Rightsizing is separate

Rightsizing uses container demand metrics to provide workload-level request guidance. OpenCost provides the cost context, but it does not produce Radar’s request suggestions.