Knative Subscriptions API

openapi: 3.2.0
info:
  title: Knative Eventing Subscriptions API
  description: The Knative Eventing API extends Kubernetes with custom resources for building event-driven architectures.
  version: '1.0'
  contact:
    name: Knative Community
    url: https://knative.dev/community/
servers:
- url: https://kubernetes.default.svc
  description: Kubernetes API Server (in-cluster)
security:
- bearerAuth: []
tags:
- name: Subscriptions
  description: Knative Subscription resources define a delivery destination for events sent to a Channel. Each Subscription routes events from a Channel to a subscriber destination with optional reply and dead-letter handling.
paths:
  /apis/messaging.knative.dev/v1/namespaces/{namespace}/subscriptions:
    get:
      operationId: listSubscriptions
      summary: Knative List Subscriptions
      description: Returns a list of all Subscription resources in the specified namespace. Subscriptions route events from a Channel to a subscriber destination with optional reply and dead-letter sink configuration.
      tags:
      - Subscriptions
      parameters:
      - $ref: '#/components/parameters/namespace'
      - $ref: '#/components/parameters/labelSelector'
      - $ref: '#/components/parameters/limit'
      - $ref: '#/components/parameters/continueToken'
      responses:
        '200':
          description: Successfully listed Subscriptions.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SubscriptionList'
        '401':
          $ref: '#/components/responses/Unauthorized'
    post:
      operationId: createSubscription
      summary: Knative Create a Subscription
      description: Creates a new Subscription to a Channel. Events received by the Channel are independently delivered to each Subscription's subscriber destination. Reply events from the subscriber can be forwarded to another destination.
      tags:
      - Subscriptions
      parameters:
      - $ref: '#/components/parameters/namespace'
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Subscription'
      responses:
        '201':
          description: Subscription successfully created.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Subscription'
        '400':
          $ref: '#/components/responses/BadRequest'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '409':
          $ref: '#/components/responses/Conflict'
  /apis/messaging.knative.dev/v1/namespaces/{namespace}/subscriptions/{name}:
    get:
      operationId: getSubscription
      summary: Knative Get a Subscription
      description: Returns details of a specific Subscription including its Channel reference, subscriber destination, reply destination, and dead-letter sink configuration.
      tags:
      - Subscriptions
      parameters:
      - $ref: '#/components/parameters/namespace'
      - $ref: '#/components/parameters/name'
      responses:
        '200':
          description: Successfully retrieved the Subscription.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Subscription'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
    delete:
      operationId: deleteSubscription
      summary: Knative Delete a Subscription
      description: Deletes a Subscription. The subscriber destination will stop receiving events from the associated Channel.
      tags:
      - Subscriptions
      parameters:
      - $ref: '#/components/parameters/namespace'
      - $ref: '#/components/parameters/name'
      responses:
        '200':
          description: Subscription deletion initiated.
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Status'
        '401':
          $ref: '#/components/responses/Unauthorized'
        '404':
          $ref: '#/components/responses/NotFound'
components:
  schemas:
    ObjectMeta:
      type: object
      description: Standard Kubernetes object metadata.
      required:
      - name
      properties:
        name:
          type: string
          description: Unique name of the resource within its namespace.
        namespace:
          type: string
          description: Namespace the resource belongs to.
        labels:
          type: object
          description: Key-value labels for organizing and selecting resources.
          additionalProperties:
            type: string
        annotations:
          type: object
          description: Non-identifying metadata for the resource.
          additionalProperties:
            type: string
        resourceVersion:
          type: string
          description: Opaque string identifying the resource version.
        uid:
          type: string
          description: Unique identifier assigned by the API server.
        generation:
          type: integer
          description: Sequence number incremented on each spec change.
        creationTimestamp:
          type: string
          format: date-time
          description: Time the resource was created.
    Destination:
      type: object
      description: A destination for delivering CloudEvents. Can reference a Kubernetes service, a Knative Service, a Broker, or a Channel via ref, or specify a direct URI.
      properties:
        ref:
          type: object
          description: Reference to a Kubernetes resource that is a destination.
          required:
          - apiVersion
          - kind
          - name
          properties:
            apiVersion:
              type: string
              description: API version of the destination resource.
            kind:
              type: string
              description: Kind of the destination resource.
            name:
              type: string
              description: Name of the destination resource.
            namespace:
              type: string
              description: Namespace of the destination resource.
        uri:
          type: string
          format: uri
          description: Direct URI to deliver events to. Mutually exclusive with ref.
    DeliverySpec:
      type: object
      description: Delivery configuration for event sources and Brokers.
      properties:
        deadLetterSink:
          $ref: '#/components/schemas/Destination'
          description: Destination for events that cannot be delivered after retries.
        retry:
          type: integer
          minimum: 0
          description: Minimum number of retries before sending to the dead-letter sink.
        backoffPolicy:
          type: string
          enum:
          - linear
          - exponential
          description: Backoff policy for retries.
        backoffDelay:
          type: string
          description: Delay between retries in ISO 8601 duration format, for example PT2S.
        timeout:
          type: string
          description: Timeout per delivery attempt in ISO 8601 duration format.
    Condition:
      type: object
      description: A status condition on a Knative resource.
      required:
      - type
      - status
      properties:
        type:
          type: string
          description: Type of condition such as Ready or Addressable.
        status:
          type: string
          enum:
          - 'True'
          - 'False'
          - Unknown
          description: Status of the condition.
        reason:
          type: string
          description: Machine-readable reason for the last transition.
        message:
          type: string
          description: Human-readable message for the condition.
        lastTransitionTime:
          type: string
          format: date-time
          description: Time of the last condition transition.
    Status:
      type: object
      description: Kubernetes API Status response.
      properties:
        apiVersion:
          type: string
          description: API version of the Status object.
        kind:
          type: string
          const: Status
          description: Always Status.
        status:
          type: string
          description: Success or Failure.
        message:
          type: string
          description: Human-readable description.
        reason:
          type: string
          description: Machine-readable reason.
        code:
          type: integer
          description: HTTP status code.
    Subscription:
      type: object
      description: A Knative Subscription that routes events from a Channel to a subscriber destination. Each Subscription maintains its own delivery state independently of other Subscriptions on the same Channel.
      required:
      - apiVersion
      - kind
      - metadata
      - spec
      properties:
        apiVersion:
          type: string
          const: messaging.knative.dev/v1
          description: API version for the Subscription.
        kind:
          type: string
          const: Subscription
          description: Resource kind identifier.
        metadata:
          $ref: '#/components/schemas/ObjectMeta'
        spec:
          type: object
          description: Specification for the Subscription.
          required:
          - channel
          properties:
            channel:
              type: object
              description: Reference to the Channel to subscribe to.
              required:
              - name
              properties:
                apiVersion:
                  type: string
                  description: API version of the Channel.
                kind:
                  type: string
                  description: Kind of the Channel resource.
                name:
                  type: string
                  description: Name of the Channel.
            subscriber:
              $ref: '#/components/schemas/Destination'
            reply:
              $ref: '#/components/schemas/Destination'
            delivery:
              $ref: '#/components/schemas/DeliverySpec'
        status:
          type: object
          description: Status of the Subscription.
          properties:
            physicalSubscription:
              type: object
              description: Resolved physical subscription details set by the controller.
              properties:
                subscriberUri:
                  type: string
                  format: uri
                  description: Resolved subscriber URI.
                replyUri:
                  type: string
                  format: uri
                  description: Resolved reply URI.
                deadLetterSinkUri:
                  type: string
                  format: uri
                  description: Resolved dead-letter sink URI.
            conditions:
              type: array
              description: Status conditions for the Subscription.
              items:
                $ref: '#/components/schemas/Condition'
    SubscriptionList:
      type: object
      description: A list of Subscription resources.
      required:
      - apiVersion
      - kind
      - items
      properties:
        apiVersion:
          type: string
          description: API version for the list.
        kind:
          type: string
          const: SubscriptionList
          description: List kind identifier.
        metadata:
          type: object
          properties:
            resourceVersion:
              type: string
              description: Resource version of the list.
            continue:
              type: string
              description: Pagination continuation token.
        items:
          type: array
          description: List of Subscription resources.
          items:
            $ref: '#/components/schemas/Subscription'
  parameters:
    limit:
      name: limit
      in: query
      required: false
      description: Maximum number of items to return in a single response.
      schema:
        type: integer
        minimum: 1
    continueToken:
      name: continue
      in: query
      required: false
      description: Pagination token returned by a previous list call.
      schema:
        type: string
    namespace:
      name: namespace
      in: path
      required: true
      description: Kubernetes namespace containing the resource.
      schema:
        type: string
    name:
      name: name
      in: path
      required: true
      description: Name of the Knative resource.
      schema:
        type: string
    labelSelector:
      name: labelSelector
      in: query
      required: false
      description: Selector to filter resources by label key-value pairs.
      schema:
        type: string
  responses:
    BadRequest:
      description: The request was malformed or failed validation.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Status'
    Unauthorized:
      description: Authentication credentials are missing or invalid.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Status'
    NotFound:
      description: The requested resource was not found.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Status'
    Conflict:
      description: A resource with this name already exists.
      content:
        application/json:
          schema:
            $ref: '#/components/schemas/Status'
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      bearerFormat: JWT
      description: Kubernetes service account token or user bearer token. RBAC policies control access to Knative Eventing resources.
externalDocs:
  description: Knative Eventing API Reference
  url: https://knative.dev/docs/eventing/reference/eventing-api/