openapi: 3.1.0
info:
  title: Prometheus Alertmanager Admin Targets API
  description: The Prometheus Alertmanager HTTP API v2 provides endpoints for querying active alert status, creating and managing silences, retrieving receiver configurations, and checking cluster peer status. Alertmanager deduplicates, groups, and routes alert notifications to receivers such as email, PagerDuty, Slack, and OpsGenie. The API base path is /api/v2.
  version: v0.28.0
  contact:
    name: Prometheus Project
    url: https://prometheus.io/community/
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0
servers:
- url: http://{host}:{port}
  description: Alertmanager server
  variables:
    host:
      default: localhost
      description: Alertmanager server hostname
    port:
      default: '9093'
      description: Alertmanager server port
tags:
- name: Targets
  description: Endpoints for discovering scrape targets and their current health status.
paths:
  /api/v1/targets:
    get:
      operationId: getTargets
      summary: Prometheus Get scrape targets
      description: Returns an overview of the current state of the Prometheus target discovery including active and dropped targets, their labels, and scrape health status.
      tags:
      - Targets
      parameters:
      - name: state
        in: query
        description: Filter targets by state.
        schema:
          type: string
          enum:
          - active
          - dropped
          - any
          default: any
      responses:
        '200':
          description: Targets returned successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TargetsResponse'
  /api/v1/targets/metadata:
    get:
      operationId: getTargetMetadata
      summary: Prometheus Get target metadata
      description: Returns metadata about metrics for individual targets. Allows filtering by target label matchers and metric name to retrieve per-target metadata contributed by scrape pools.
      tags:
      - Targets
      parameters:
      - name: match_target
        in: query
        description: Label selectors matching target labels.
        schema:
          type: string
      - name: metric
        in: query
        description: Metric name to filter by.
        schema:
          type: string
      - $ref: '#/components/parameters/Limit'
      responses:
        '200':
          description: Target metadata returned successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TargetMetadataResponse'
        '400':
          description: Bad request
components:
  schemas:
    TargetMetadataResponse:
      type: object
      description: Response containing per-target metric metadata.
      required:
      - status
      - data
      properties:
        status:
          type: string
          enum:
          - success
          - error
        data:
          type: array
          items:
            type: object
            properties:
              target:
                type: object
                additionalProperties:
                  type: string
                description: Labels identifying the target.
              metric:
                type: string
                description: Metric name.
              type:
                type: string
                description: Metric type.
              help:
                type: string
                description: Help text.
              unit:
                type: string
                description: Unit.
    DroppedTarget:
      type: object
      description: A scrape target dropped by relabeling.
      properties:
        discoveredLabels:
          type: object
          additionalProperties:
            type: string
          description: Labels from service discovery before the target was dropped.
    ActiveTarget:
      type: object
      description: An active scrape target.
      properties:
        discoveredLabels:
          type: object
          additionalProperties:
            type: string
          description: Unmodified labels before relabeling from service discovery.
        labels:
          type: object
          additionalProperties:
            type: string
          description: Labels after relabeling.
        scrapePool:
          type: string
          description: The scrape pool this target belongs to.
        scrapeUrl:
          type: string
          format: uri
          description: The URL Prometheus will scrape.
        globalUrl:
          type: string
          description: The globally accessible scrape URL.
        lastError:
          type: string
          description: Error from the last scrape, empty if successful.
        lastScrape:
          type: string
          format: date-time
          description: Timestamp of the last scrape.
        lastScrapeDuration:
          type: number
          description: Duration of the last scrape in seconds.
        health:
          type: string
          enum:
          - up
          - down
          - unknown
          description: Health status of the target.
        scrapeInterval:
          type: string
          description: The scrape interval for this target.
        scrapeTimeout:
          type: string
          description: The scrape timeout for this target.
    TargetsResponse:
      type: object
      description: Response containing active and dropped scrape targets.
      required:
      - status
      - data
      properties:
        status:
          type: string
          enum:
          - success
          - error
        data:
          type: object
          properties:
            activeTargets:
              type: array
              items:
                $ref: '#/components/schemas/ActiveTarget'
              description: List of currently active scrape targets.
            droppedTargets:
              type: array
              items:
                $ref: '#/components/schemas/DroppedTarget'
              description: List of dropped targets from service discovery.
  parameters:
    Limit:
      name: limit
      in: query
      description: Maximum number of items to return.
      schema:
        type: integer
        minimum: 1
externalDocs:
  description: Alertmanager Documentation
  url: https://prometheus.io/docs/alerting/latest/alertmanager/