Cast AI Hosted Model Events API

openapi: 3.2.0
info:
  title: AI Enabler Hosted Model Events API
  version: 0.0.1
  description: Provides the API for retrieving hosted model events.
servers:
- url: https://api.cast.ai/
  description: US endpoint
- url: https://api.eu.cast.ai/
  description: EU endpoint
security:
- BearerAuth: []
- ApiKeyAuth: []
tags:
- name: HostedModelEventsAPI
  description: Provides the API for retrieving hosted model events.
paths:
  /ai-optimizer/v1beta/organizations/{organizationId}/clusters/{clusterId}/hosted-models/{hostedModelId}/events:
    get:
      tags:
      - HostedModelEventsAPI
      summary: List hosted model events
      description: Retrieves a paginated list of events for a specific hosted model.
      operationId: HostedModelEventsAPI_ListHostedModelEvents
      parameters:
      - name: organizationId
        in: path
        description: The ID of the organization that owns the hosted model.
        required: true
        schema:
          type: string
      - name: clusterId
        in: path
        description: The ID of the cluster where the hosted model is deployed.
        required: true
        schema:
          type: string
      - name: hostedModelId
        in: path
        description: The ID of the hosted model for which events are requested.
        required: true
        schema:
          type: string
      - name: page.limit
        in: query
        description: Defines the number of items that should be returned
        schema:
          type: string
      - name: page.cursor
        in: query
        description: "Cursor that defines token indicating where to start the next page.\n Empty value indicates to start from beginning of the dataset."
        schema:
          type: string
      - name: startTime
        in: query
        description: Start time filter for events.
        schema:
          type: string
          format: date-time
      - name: endTime
        in: query
        description: End time filter for events.
        schema:
          type: string
          format: date-time
      responses:
        '200':
          description: OK
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ListHostedModelEventsResponse'
        default:
          description: Default error response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Status'
components:
  schemas:
    Status:
      type: object
      properties:
        code:
          type: integer
          description: The status code, which should be an enum value of [google.rpc.Code][google.rpc.Code].
          format: int32
        message:
          type: string
          description: A developer-facing error message, which should be in English. Any user-facing error message should be localized and sent in the [google.rpc.Status.details][google.rpc.Status.details] field, or localized by the client.
        details:
          type: array
          items:
            $ref: '#/components/schemas/GoogleProtobufAny'
          description: A list of messages that carry the error details.  There is a common set of message types for APIs to use.
      description: 'The `Status` type defines a logical error model that is suitable for different programming environments, including REST APIs and RPC APIs. It is used by [gRPC](https://github.com/grpc). Each `Status` message contains three pieces of data: error code, error message, and error details. You can find out more about this error model and how to work with it in the [API Design Guide](https://cloud.google.com/apis/design/errors).'
    HostedModelEvent:
      required:
      - id
      - organizationId
      - clusterId
      - hostedModelId
      - createTime
      - type
      - initiator
      - scaledUp
      - scaledDown
      - hibernated
      - resumed
      - interrupted
      type: object
      properties:
        id:
          type: string
          description: ID for this event.
        organizationId:
          type: string
          description: Organization ID that owns the hosted model.
        clusterId:
          type: string
          description: The ID of the cluster where the hosted model is deployed.
        hostedModelId:
          type: string
          description: Hosted model ID this event relates to.
        createTime:
          type: string
          description: Timestamp when the event occurred.
          format: date-time
        type:
          enum:
          - TYPE_UNSPECIFIED
          - SCALED_UP
          - SCALED_DOWN
          - HIBERNATED
          - RESUMED
          - INTERRUPTED
          type: string
          description: Type of event that occurred.
          format: enum
        initiator:
          allOf:
          - $ref: '#/components/schemas/HostedModelEvent_Initiator'
          description: Information about who or what initiated this event.
        scaledUp:
          allOf:
          - $ref: '#/components/schemas/HostedModelEvent_AutoscalingEventData'
          description: Scale-up event details.
        scaledDown:
          allOf:
          - $ref: '#/components/schemas/HostedModelEvent_AutoscalingEventData'
          description: Scale-down event details.
        hibernated:
          allOf:
          - $ref: '#/components/schemas/HostedModelEvent_HibernationEventData'
          description: Hibernation event details.
        resumed:
          allOf:
          - $ref: '#/components/schemas/HostedModelEvent_HibernationEventData'
          description: Resumption event details.
        interrupted:
          allOf:
          - $ref: '#/components/schemas/HostedModelEvent_InterruptedEventData'
          description: Interruption event details.
      description: Event representing a significant change in a hosted model's lifecycle.
    HostedModelEvent_AutoscalingEventData:
      required:
      - fromReplicas
      - toReplicas
      - targetMetric
      - targetValue
      - description
      type: object
      properties:
        fromReplicas:
          type: integer
          description: Number of replicas before scaling.
          format: int32
        toReplicas:
          type: integer
          description: Number of replicas after scaling.
          format: int32
        targetMetric:
          enum:
          - AUTOSCALING_METRIC_UNSPECIFIED
          - NUMBER_OF_REQUESTS_WAITING
          - GPU_CACHE_USAGE_PERCENTAGE
          type: string
          description: Metric that triggered the scaling decision.
          format: enum
        targetValue:
          type: number
          description: Target value for the metric.
          format: float
        description:
          type: string
          description: Human-readable description of the scaling reason.
      description: Detailed information about autoscaling operations.
    HostedModelEvent_Initiator:
      required:
      - userType
      type: object
      properties:
        id:
          type: string
          description: The ID of the user. Empty if it was initiated by the system.
        name:
          type: string
          description: The name of the user. Empty if it was initiated by the system.
        email:
          type: string
          description: The email of the user. Empty if it was initiated by the system.
        userType:
          enum:
          - USER_TYPE_UNSPECIFIED
          - SYSTEM
          - USER
          type: string
          description: User type that initiated the event.
          format: enum
      description: A user who initiated the event
    ListHostedModelEventsResponse:
      required:
      - items
      - totalCount
      type: object
      properties:
        items:
          type: array
          items:
            $ref: '#/components/schemas/HostedModelEvent'
          description: List of hosted model events ordered by creation time (newest first).
        nextPageCursor:
          type: string
          description: Cursor for retrieving the next page of results.
        totalCount:
          type: integer
          description: Total number of events matching the request criteria.
          format: int32
      description: Response containing paginated list of hosted model events.
    HostedModelEvent_InterruptedEventData:
      required:
      - nodeName
      - description
      - podNames
      type: object
      properties:
        nodeName:
          type: string
          description: The name of the node that was interrupted.
        description:
          type: string
          description: Human-readable description of the reason.
        podNames:
          type: array
          items:
            type: string
          description: Names of the affected pods.
      description: Detailed information about interruption events.
    HostedModelEvent_HibernationEventData:
      required:
      - requestCount
      - duration
      - description
      type: object
      properties:
        requestCount:
          type: integer
          description: Number of requests during the hibernation period.
          format: uint32
        duration:
          pattern: ^-?(?:0|[1-9][0-9]{0,11})(?:\.[0-9]{1,9})?s$
          type: string
          description: Duration of the hibernation period.
        description:
          type: string
          description: Human-readable description of the hibernation reason.
      description: Detailed information about hibernation operations.
    GoogleProtobufAny:
      type: object
      properties:
        '@type':
          type: string
          description: The type of the serialized message.
      additionalProperties: true
      description: Contains an arbitrary serialized message along with a @type that describes the type of the serialized message.
  securitySchemes:
    BearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
    ApiKeyAuth:
      type: apiKey
      in: header
      name: X-API-Key
x-provenance:
  method: searched
  source: https://docs.cast.ai/reference
  harvested: '2026-10-20'
  tool: harvest-readme-openapi.py
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