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Idle GKE Autopilot Clusters with Always-On System Overhead
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Idle GKE Autopilot Clusters with Always-On System Overhead
Service Category
Compute
Cloud Provider
GCP
Service Name
GCP GKE
Inefficiency Type
Inactive Resource Consuming Baseline Costs
Explanation

Even when no user workloads are active, GKE Autopilot clusters continue running system-managed pods that accrue compute and storage charges. These include control plane components and built-in agents for observability and networking. If Autopilot clusters are deployed in non-production or experimental environments and left idle, they may silently accrue ongoing charges unrelated to application activity. This inefficiency often occurs in: * Dev/test clusters that are spun up temporarily but not deleted * Clusters used for one-time jobs or training workloads * Scheduled workloads that run infrequently but don't trigger downscaling

Relevant Billing Model

* Billed per vCPU, memory, and ephemeral storage requested by running pods * Baseline system pods (e.g., logging agents, kube-system) incur cost even with zero user workloads * Clusters themselves do not scale to zero — an idle Autopilot cluster still incurs a minimum charge

Detection
  • Identify GKE Autopilot clusters with no active user-deployed workloads over a representative time window
  • Confirm that cluster billing continues despite low or no pod activity
  • Assess whether any scheduled workloads justify keeping the cluster online
  • Review tagging or naming conventions to isolate non-production or experimental environments
  • Evaluate whether clusters are still needed or can be replaced with on-demand environments (e.g., Cloud Run)
Remediation
  • Delete unused Autopilot clusters in dev, test, or sandbox environments
  • Replace infrequently used workloads with serverless alternatives like Cloud Run or Cloud Functions
  • Implement automation to tear down unused clusters after inactivity thresholds
  • Consider switching to Standard mode with custom node pools if greater control over scaling and cost is needed
Relevant Documentation
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