openapi: 3.1.0
info:
  title: Prometheus Alertmanager Admin Silences 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: Silences
  description: Endpoints for creating, listing, updating, and expiring silences that mute matching alerts.
paths:
  /api/v2/silences:
    get:
      operationId: listSilences
      summary: Prometheus List silences
      description: Returns a list of all silences including pending, active, and expired silences. Silences mute alerts matching their matchers for a defined time range.
      tags:
      - Silences
      parameters:
      - name: filter
        in: query
        description: Label matchers to filter silences by.
        schema:
          type: array
          items:
            type: string
      responses:
        '200':
          description: Silences returned successfully
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/GettableSilence'
        '400':
          description: Bad request
    post:
      operationId: createSilence
      summary: Prometheus Create or update silence
      description: Creates a new silence or updates an existing one. To update, include the ID of the existing silence. Silences mute all alerts whose labels match every matcher in the silence for the specified time period.
      tags:
      - Silences
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/PostableSilence'
      responses:
        '200':
          description: Silence created or updated
          content:
            application/json:
              schema:
                type: object
                properties:
                  silenceID:
                    type: string
                    format: uuid
                    description: ID of the created or updated silence.
        '400':
          description: Bad request — invalid silence definition
        '404':
          description: Silence not found (when updating by ID)
  /api/v2/silence/{silenceID}:
    get:
      operationId: getSilence
      summary: Prometheus Get silence by ID
      description: Returns the silence with the specified ID, including its matchers, time range, creator, and current status.
      tags:
      - Silences
      parameters:
      - $ref: '#/components/parameters/SilenceID'
      responses:
        '200':
          description: Silence returned successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/GettableSilence'
        '404':
          description: Silence not found
    delete:
      operationId: deleteSilence
      summary: Prometheus Expire silence
      description: Expires a silence, setting its end time to now. Expired silences no longer mute alerts but remain visible until fully removed.
      tags:
      - Silences
      parameters:
      - $ref: '#/components/parameters/SilenceID'
      responses:
        '200':
          description: Silence expired successfully
        '404':
          description: Silence not found
        '500':
          description: Internal error expiring silence
components:
  schemas:
    GettableSilence:
      type: object
      description: A silence as returned by Alertmanager with full metadata.
      required:
      - id
      - status
      - updatedAt
      - matchers
      - startsAt
      - endsAt
      - createdBy
      - comment
      properties:
        id:
          type: string
          format: uuid
          description: Unique identifier of the silence.
        status:
          type: object
          properties:
            state:
              type: string
              enum:
              - expired
              - active
              - pending
              description: Current state of the silence.
        updatedAt:
          type: string
          format: date-time
          description: Timestamp of the last update to this silence.
        matchers:
          type: array
          items:
            $ref: '#/components/schemas/Matcher'
          description: Label matchers that determine which alerts this silence affects.
        startsAt:
          type: string
          format: date-time
          description: When the silence takes effect.
        endsAt:
          type: string
          format: date-time
          description: When the silence expires.
        createdBy:
          type: string
          description: The person or system that created this silence.
        comment:
          type: string
          description: A comment explaining the reason for the silence.
    PostableSilence:
      type: object
      description: Silence definition for creation or update.
      required:
      - matchers
      - startsAt
      - endsAt
      - createdBy
      - comment
      properties:
        id:
          type: string
          format: uuid
          description: ID of existing silence to update. Omit for creation.
        matchers:
          type: array
          items:
            $ref: '#/components/schemas/Matcher'
          description: Label matchers for the silence.
        startsAt:
          type: string
          format: date-time
          description: When the silence takes effect.
        endsAt:
          type: string
          format: date-time
          description: When the silence expires.
        createdBy:
          type: string
          description: The person or system creating this silence.
        comment:
          type: string
          description: Reason for the silence.
    Matcher:
      type: object
      description: A label matcher used in silences and routes.
      required:
      - name
      - value
      - isRegex
      properties:
        name:
          type: string
          description: Label name to match.
        value:
          type: string
          description: Label value or regex to match against.
        isRegex:
          type: boolean
          description: Whether value is a regular expression.
        isEqual:
          type: boolean
          description: Whether the match is equality (true) or inequality (false).
          default: true
  parameters:
    SilenceID:
      name: silenceID
      in: path
      required: true
      description: UUID identifier of the silence.
      schema:
        type: string
        format: uuid
externalDocs:
  description: Alertmanager Documentation
  url: https://prometheus.io/docs/alerting/latest/alertmanager/