openapi: 3.1.0
info:
  title: CAST AI Kubernetes Cost Optimization AI Enabler External Clusters API
  description: CAST AI is a Kubernetes cost optimization platform that provides APIs for managing clusters, autoscaling, node configuration, workload optimization, cost reporting, security insights, and more. The platform continuously monitors clusters and optimizes them for cost efficiency using autoscaling, spot instance automation, bin packing, and other techniques.
  version: 1.0.0
  contact:
    name: CAST AI
    url: https://cast.ai
  termsOfService: https://cast.ai/terms-of-service
servers:
- url: https://api.cast.ai/v1
  description: CAST AI Production API
security:
- ApiKeyAuth: []
tags:
- name: External Clusters
  description: Manage external Kubernetes clusters connected to CAST AI, including listing nodes, draining nodes, and cluster operations.
paths:
  /kubernetes/external-clusters/{clusterId}/nodes:
    get:
      operationId: ExternalClusterAPI_ListNodes
      summary: CAST AI List cluster nodes
      description: Lists the nodes for a cluster.
      tags:
      - External Clusters
      parameters:
      - $ref: '#/components/parameters/ClusterId'
      responses:
        '200':
          description: Successful response with list of nodes.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListNodesResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /kubernetes/external-clusters/{clusterId}/nodes/{nodeId}/drain:
    post:
      operationId: ExternalClusterAPI_DrainNode
      summary: CAST AI Drain cluster node
      description: Drains the specified cluster node.
      tags:
      - External Clusters
      parameters:
      - $ref: '#/components/parameters/ClusterId'
      - $ref: '#/components/parameters/NodeId'
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/DrainNodeRequest'
      responses:
        '200':
          description: Node drain initiated successfully.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/DrainNodeResponse'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
  /kubernetes/external-clusters/{clusterId}/nodes/{nodeId}:
    delete:
      operationId: ExternalClusterAPI_DeleteNode
      summary: CAST AI Delete cluster node
      description: Deletes the specified cluster node.
      tags:
      - External Clusters
      parameters:
      - $ref: '#/components/parameters/ClusterId'
      - $ref: '#/components/parameters/NodeId'
      responses:
        '200':
          description: Node deleted successfully.
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  schemas:
    Node:
      type: object
      properties:
        id:
          type: string
          format: uuid
        name:
          type: string
        instanceType:
          type: string
        state:
          type: string
          enum:
          - ready
          - not_ready
          - draining
          - deleting
        createdAt:
          type: string
          format: date-time
        labels:
          type: object
          additionalProperties:
            type: string
    DrainNodeRequest:
      type: object
      properties:
        force:
          type: boolean
          description: Whether to force drain the node.
        timeout:
          type: integer
          description: Drain timeout in seconds.
    DrainNodeResponse:
      type: object
      properties:
        nodeId:
          type: string
          format: uuid
        status:
          type: string
    Error:
      type: object
      properties:
        message:
          type: string
          description: Human-readable error message.
        code:
          type: integer
          description: Error code.
    ListNodesResponse:
      type: object
      properties:
        items:
          type: array
          items:
            $ref: '#/components/schemas/Node'
  responses:
    Unauthorized:
      description: Authentication failed. Invalid or missing API key.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
    NotFound:
      description: The requested resource was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Error'
  parameters:
    ClusterId:
      name: clusterId
      in: path
      required: true
      description: The unique identifier of the cluster.
      schema:
        type: string
        format: uuid
    NodeId:
      name: nodeId
      in: path
      required: true
      description: The unique identifier of the node.
      schema:
        type: string
        format: uuid
  securitySchemes:
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
      description: API key for authentication. Create access keys from the CAST AI console under API > API access keys.
externalDocs:
  description: CAST AI API Documentation
  url: https://docs.cast.ai/docs/api