How to: Configuration
Key environment variables:

| Variable | Description | Default |
|----------|-------------|---------|
| `KOA_K8S_API_ENDPOINT` | Kubernetes API server URL | Required |
| `KOA_K8S_AUTH_TOKEN` | Service account token | Auto-detected in-cluster |
| `KOA_DB_LOCATION` | Path for RRDtool databases | `/data` |
| `KOA_POLLING_INTERVAL_SEC` | Metrics collection interval | `300` |
| `KOA_COST_MODEL` | Billing model (`CUMULATIVE_RATIO`, `RATIO`, `CHARGE_BACK`) | `CUMULATIVE_RATIO` |
| `KOA_BILLING_HOURLY_RATE` | Hourly cost for chargeback model | `-1.0` |
| `KOA_BILLING_CURRENCY_SYMBOL` | Currency symbol for cost display | `$` |
| `KOA_NVIDIA_DCGM_ENDPOINT` | NVIDIA DCGM Exporter endpoint for GPU metrics | Not set (GPU disabled) |