openapi: 3.1.0
info:
  title: Prometheus Alertmanager 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
externalDocs:
  description: Alertmanager Documentation
  url: https://prometheus.io/docs/alerting/latest/alertmanager/
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.
  - name: Receivers
    description: >-
      Endpoints for listing configured alert receivers.
  - name: Silences
    description: >-
      Endpoints for creating, listing, updating, and expiring silences that
      mute matching alerts.
  - name: Status
    description: >-
      Endpoints for retrieving Alertmanager configuration, cluster status,
      and version information.
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/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
  /api/v2/receivers:
    get:
      operationId: listReceivers
      summary: Prometheus List receivers
      description: >-
        Returns a list of all configured alert receivers. Receivers are the
        notification integrations (email, Slack, PagerDuty, etc.) configured
        in the Alertmanager configuration file.
      tags:
        - Receivers
      responses:
        '200':
          description: Receivers returned successfully
          content:
            application/json:
              schema:
                type: array
                items:
                  $ref: '#/components/schemas/Receiver'
  /api/v2/status:
    get:
      operationId: getStatus
      summary: Prometheus Get Alertmanager status
      description: >-
        Returns the current status of the Alertmanager including the current
        loaded configuration, cluster peers, and version information.
      tags:
        - Status
      responses:
        '200':
          description: Status returned successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AlertmanagerStatus'
  /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
components:
  parameters:
    SilenceID:
      name: silenceID
      in: path
      required: true
      description: UUID identifier of the silence.
      schema:
        type: string
        format: uuid
  schemas:
    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'
    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.
    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.
    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
    Receiver:
      type: object
      description: An Alertmanager notification receiver.
      required:
        - name
      properties:
        name:
          type: string
          description: Receiver name as defined in the configuration file.
    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.
    AlertmanagerStatus:
      type: object
      description: Overall status of the Alertmanager instance.
      required:
        - cluster
        - versionInfo
        - config
        - uptime
      properties:
        cluster:
          type: object
          description: Cluster peer status.
          properties:
            name:
              type: string
              description: Name of this cluster member.
            status:
              type: string
              enum:
                - ready
                - settling
                - disabled
              description: Cluster status.
            peers:
              type: array
              items:
                type: object
                properties:
                  name:
                    type: string
                    description: Peer name.
                  address:
                    type: string
                    description: Peer address.
        versionInfo:
          type: object
          description: Version information.
          properties:
            version:
              type: string
            revision:
              type: string
            branch:
              type: string
            buildUser:
              type: string
            buildDate:
              type: string
            goVersion:
              type: string
        config:
          type: object
          description: Currently loaded configuration.
          properties:
            original:
              type: string
              description: The raw configuration file content as a string.
        uptime:
          type: string
          format: date-time
          description: Timestamp when Alertmanager started.