openapi: 3.1.0
info:
  title: Prometheus Alertmanager Admin Alerts 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: Alerts
  description: Endpoints for listing and creating alerts in the Alertmanager.
paths:
  /api/v2/alerts:
    get:
      operationId: getAlerts
      summary: Prometheus Get active alerts
      description: Returns a list of active alerts currently managed by Alertmanager. Supports filtering by silenced, inhibited, active state, and label matchers.
      tags:
      - Alerts
      parameters:
      - name: active
        in: query
        description: Only return active (non-silenced, non-inhibited) alerts.
        schema:
          type: boolean
          default: true
      - name: silenced
        in: query
        description: Include silenced alerts in results.
        schema:
          type: boolean
          default: false
      - name: inhibited
        in: query
        description: Include inhibited alerts in results.
        schema:
          type: boolean
          default: false
      - name: unprocessed
        in: query
        description: Include unprocessed alerts that have not yet been routed.
        schema:
          type: boolean
          default: false
      - name: filter
        in: query
        description: A list of label matchers to filter alerts by. Matchers use the syntax label=value, label!=value, label=~regex, or label!~regex.
        schema:
          type: array
          items:
            type: string
      - name: receiver
        in: query
        description: Filter by receiver name.
        schema:
          type: string
      responses:
        '200':
          description: Active alerts returned successfully
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/GettableAlert'
        '400':
          description: Bad request — invalid filter matchers
    post:
      operationId: postAlerts
      summary: Prometheus Post alerts
      description: Creates or updates alerts in Alertmanager. Prometheus typically calls this endpoint to send firing alerts. Each alert must include a labels map; generatorURL is optional but recommended for linking back to the triggering expression.
      tags:
      - Alerts
      requestBody:
        required: true
        content:
          application/json:
            schema:
              type: array
              items:
                $ref: '#/components/schemas/PostableAlert'
      responses:
        '200':
          description: Alerts accepted
        '400':
          description: Bad request — invalid alert format
        '500':
          description: Internal server error
  /api/v2/alerts/groups:
    get:
      operationId: getAlertGroups
      summary: Prometheus Get alert groups
      description: Returns a list of alert groups. Alertmanager groups alerts by their group labels as configured in routing rules. Each group has a receiver and a set of alerts.
      tags:
      - Alerts
      parameters:
      - name: active
        in: query
        description: Include active alerts.
        schema:
          type: boolean
          default: true
      - name: silenced
        in: query
        description: Include silenced alerts.
        schema:
          type: boolean
          default: false
      - name: inhibited
        in: query
        description: Include inhibited alerts.
        schema:
          type: boolean
          default: false
      - name: filter
        in: query
        description: Label matchers to filter by.
        schema:
          type: array
          items:
            type: string
      - name: receiver
        in: query
        description: Filter by receiver name.
        schema:
          type: string
      responses:
        '200':
          description: Alert groups returned successfully
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/AlertGroup'
        '400':
          description: Bad request
  /api/v1/alerts:
    get:
      operationId: getAlerts
      summary: Prometheus Get alerts
      description: Returns a list of all active alerts currently firing or pending in Prometheus. Alerts include their labels, state, and timestamps.
      tags:
      - Alerts
      responses:
        '200':
          description: Alerts returned successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AlertsResponse'
components:
  schemas:
    Receiver:
      type: object
      description: An Alertmanager notification receiver.
      required:
      - name
      properties:
        name:
          type: string
          description: Receiver name as defined in the configuration file.
    AlertStatus:
      type: object
      description: The current routing and inhibition status of an alert.
      required:
      - state
      - silencedBy
      - inhibitedBy
      properties:
        state:
          type: string
          enum:
          - unprocessed
          - active
          - suppressed
          description: Whether the alert is active, silenced, or inhibited.
        silencedBy:
          type: array
          items:
            type: string
          description: IDs of silences that mute this alert.
        inhibitedBy:
          type: array
          items:
            type: string
          description: Fingerprints of alerts that inhibit this alert.
    PostableAlert:
      type: object
      description: An alert payload for sending to Alertmanager.
      required:
      - labels
      properties:
        labels:
          type: object
          additionalProperties:
            type: string
          description: Alert identification labels. Must include alertname.
        annotations:
          type: object
          additionalProperties:
            type: string
          description: Non-identifying metadata.
        startsAt:
          type: string
          format: date-time
          description: Alert start time. Defaults to current time if omitted.
        endsAt:
          type: string
          format: date-time
          description: Alert end time. If in the past, the alert resolves.
        generatorURL:
          type: string
          format: uri
          description: URL to the expression that triggered this alert.
    GettableAlert:
      type: object
      description: An alert as returned by Alertmanager including routing metadata.
      required:
      - labels
      - annotations
      - startsAt
      - endsAt
      - updatedAt
      - fingerprint
      - receivers
      - status
      properties:
        labels:
          type: object
          additionalProperties:
            type: string
          description: Alert identification labels including alertname.
        annotations:
          type: object
          additionalProperties:
            type: string
          description: Non-identifying metadata such as summary and description.
        startsAt:
          type: string
          format: date-time
          description: Timestamp when the alert started firing.
        endsAt:
          type: string
          format: date-time
          description: Timestamp when the alert resolves. Set far future if still active.
        updatedAt:
          type: string
          format: date-time
          description: Timestamp of the last update.
        generatorURL:
          type: string
          format: uri
          description: URL linking back to the expression that triggered this alert.
        fingerprint:
          type: string
          description: Hash identifying this unique alert label set.
        receivers:
          type: array
          items:
            $ref: '#/components/schemas/Receiver'
          description: Receivers that will be notified for this alert.
        status:
          $ref: '#/components/schemas/AlertStatus'
    AlertsResponse:
      type: object
      description: Response containing currently active alerts.
      required:
      - status
      - data
      properties:
        status:
          type: string
          enum:
          - success
          - error
        data:
          type: object
          properties:
            alerts:
              type: array
              items:
                $ref: '#/components/schemas/AlertInstance'
    AlertGroup:
      type: object
      description: A group of alerts sharing common group labels.
      required:
      - labels
      - groupLabels
      - commonLabels
      - commonAnnotations
      - externalURL
      - receiver
      - alerts
      properties:
        labels:
          type: object
          additionalProperties:
            type: string
          description: Labels common to all alerts in this group.
        groupLabels:
          type: object
          additionalProperties:
            type: string
          description: Labels used to group these alerts per the routing config.
        commonLabels:
          type: object
          additionalProperties:
            type: string
          description: Labels present on all alerts in the group.
        commonAnnotations:
          type: object
          additionalProperties:
            type: string
          description: Annotations present on all alerts in the group.
        externalURL:
          type: string
          format: uri
          description: External URL for the Alertmanager instance.
        receiver:
          $ref: '#/components/schemas/Receiver'
        alerts:
          type: array
          items:
            $ref: '#/components/schemas/GettableAlert'
          description: Alerts belonging to this group.
    AlertInstance:
      type: object
      description: An instance of a firing or pending alert.
      properties:
        labels:
          type: object
          additionalProperties:
            type: string
          description: Labels of this alert instance.
        annotations:
          type: object
          additionalProperties:
            type: string
          description: Annotations of this alert instance.
        state:
          type: string
          enum:
          - firing
          - pending
          description: Current alert state.
        activeAt:
          type: string
          format: date-time
          description: Time the alert became active.
        value:
          type: string
          description: The value of the expression at the time of the last evaluation.
externalDocs:
  description: Alertmanager Documentation
  url: https://prometheus.io/docs/alerting/latest/alertmanager/