{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "$id": "https://raw.githubusercontent.com/api-evangelist/scalable-infrastructure/main/json-schema/scalable-infrastructure-kubernetes-cluster-schema.json",
  "title": "Kubernetes Cluster",
  "description": "Describes a managed Kubernetes cluster configuration across AWS EKS, Google GKE, Azure AKS, and DigitalOcean DOKS. Covers node pools, networking, autoscaling, and access control.",
  "type": "object",
  "required": ["name", "provider", "region", "version"],
  "properties": {
    "id": {
      "type": "string",
      "description": "Provider-assigned unique cluster identifier.",
      "example": "cluster-abc123"
    },
    "name": {
      "type": "string",
      "description": "Human-readable cluster name.",
      "pattern": "^[a-z][a-z0-9-]*$",
      "minLength": 1,
      "maxLength": 63
    },
    "provider": {
      "type": "string",
      "description": "Cloud provider hosting the managed Kubernetes cluster.",
      "enum": ["aws-eks", "google-gke", "azure-aks", "digitalocean-doks", "self-managed"]
    },
    "region": {
      "type": "string",
      "description": "Cloud region where the cluster control plane resides.",
      "examples": ["us-east-1", "us-central1", "eastus", "nyc3"]
    },
    "version": {
      "type": "string",
      "description": "Kubernetes version (e.g., 1.29, 1.30).",
      "pattern": "^\\d+\\.\\d+(\\.\\d+)?$",
      "example": "1.30"
    },
    "status": {
      "type": "string",
      "description": "Current operational status of the cluster.",
      "enum": ["provisioning", "running", "upgrading", "degraded", "deleting", "deleted"],
      "default": "provisioning"
    },
    "endpoint": {
      "type": "string",
      "description": "API server endpoint URL for kubectl and client access.",
      "format": "uri"
    },
    "nodePools": {
      "type": "array",
      "description": "Node pools (worker node groups) in the cluster.",
      "minItems": 1,
      "items": {
        "$ref": "#/$defs/NodePool"
      }
    },
    "networking": {
      "$ref": "#/$defs/ClusterNetworking"
    },
    "autoscaling": {
      "$ref": "#/$defs/ClusterAutoscaling"
    },
    "addons": {
      "type": "array",
      "description": "Managed cluster add-ons or extensions enabled.",
      "items": {
        "type": "object",
        "required": ["name"],
        "properties": {
          "name": {
            "type": "string",
            "examples": ["coredns", "kube-proxy", "vpc-cni", "metrics-server", "cluster-autoscaler"]
          },
          "version": {"type": "string"},
          "enabled": {"type": "boolean", "default": true}
        }
      }
    },
    "tags": {
      "type": "object",
      "description": "Key-value metadata labels.",
      "additionalProperties": {"type": "string"}
    },
    "createdAt": {
      "type": "string",
      "format": "date-time",
      "description": "Cluster creation timestamp."
    }
  },
  "$defs": {
    "NodePool": {
      "type": "object",
      "description": "A pool of homogeneous worker nodes with shared configuration.",
      "required": ["name", "instanceType", "minCount", "maxCount"],
      "properties": {
        "name": {"type": "string", "description": "Node pool name."},
        "instanceType": {
          "type": "string",
          "description": "VM instance type/machine type.",
          "examples": ["t3.xlarge", "n2-standard-4", "Standard_D4s_v3", "s-4vcpu-8gb"]
        },
        "minCount": {"type": "integer", "minimum": 0, "description": "Minimum node count."},
        "maxCount": {"type": "integer", "minimum": 1, "description": "Maximum node count."},
        "desiredCount": {"type": "integer", "minimum": 0, "description": "Desired node count."},
        "diskSizeGB": {"type": "integer", "minimum": 20, "default": 100},
        "labels": {
          "type": "object",
          "additionalProperties": {"type": "string"},
          "description": "Kubernetes node labels."
        },
        "taints": {
          "type": "array",
          "description": "Kubernetes node taints for workload scheduling.",
          "items": {
            "type": "object",
            "properties": {
              "key": {"type": "string"},
              "value": {"type": "string"},
              "effect": {"type": "string", "enum": ["NoSchedule", "PreferNoSchedule", "NoExecute"]}
            }
          }
        },
        "spotEnabled": {
          "type": "boolean",
          "description": "Whether to use spot/preemptible instances for cost savings.",
          "default": false
        }
      }
    },
    "ClusterNetworking": {
      "type": "object",
      "description": "Cluster networking configuration.",
      "properties": {
        "vpcId": {"type": "string", "description": "VPC or network ID."},
        "podCidr": {"type": "string", "description": "CIDR block for pod IP addresses.", "example": "10.244.0.0/16"},
        "serviceCidr": {"type": "string", "description": "CIDR block for service cluster IPs.", "example": "10.96.0.0/12"},
        "cni": {
          "type": "string",
          "description": "Container Network Interface plugin.",
          "enum": ["vpc-cni", "calico", "cilium", "flannel", "weave"],
          "default": "vpc-cni"
        },
        "privateCluster": {
          "type": "boolean",
          "description": "Whether the API server is accessible only from within the VPC.",
          "default": false
        }
      }
    },
    "ClusterAutoscaling": {
      "type": "object",
      "description": "Cluster-level autoscaling settings.",
      "properties": {
        "enabled": {"type": "boolean", "default": true},
        "minNodes": {"type": "integer", "minimum": 1},
        "maxNodes": {"type": "integer", "minimum": 1},
        "scaleDownEnabled": {"type": "boolean", "default": true},
        "scaleDownDelayAfterAdd": {"type": "string", "description": "Delay after node addition before scale-down.", "example": "10m"},
        "scaleDownUnneededTime": {"type": "string", "description": "Time a node must be unneeded before removal.", "example": "10m"}
      }
    }
  }
}