openapi: 3.1.0
info:
  title: Prometheus Alertmanager Admin Metadata 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: Metadata
  description: Endpoints for querying label names, label values, series metadata, and metric metadata without executing PromQL expressions.
paths:
  /api/v1/labels:
    get:
      operationId: getLabelNames
      summary: Prometheus Get label names
      description: Returns a list of label names present in the TSDB. Optionally filtered by a time range or series selectors. Useful for building autocomplete in query UIs.
      tags:
      - Metadata
      parameters:
      - name: start
        in: query
        description: Start of the time range filter.
        schema:
          type: string
      - name: end
        in: query
        description: End of the time range filter.
        schema:
          type: string
      - name: match[]
        in: query
        description: Series selector(s) to restrict the label results.
        schema:
          type: array
          items:
            type: string
      - $ref: '#/components/parameters/Limit'
      responses:
        '200':
          description: Label names returned successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/StringListResponse'
        '400':
          description: Bad request
  /api/v1/label/{label_name}/values:
    get:
      operationId: getLabelValues
      summary: Prometheus Get label values
      description: Returns a list of values for a given label name. Optionally filtered by a time range or series selectors. The special label name __name__ returns all metric names.
      tags:
      - Metadata
      parameters:
      - name: label_name
        in: path
        required: true
        description: The label name to retrieve values for.
        schema:
          type: string
          example: job
      - name: start
        in: query
        description: Start of the time range filter.
        schema:
          type: string
      - name: end
        in: query
        description: End of the time range filter.
        schema:
          type: string
      - name: match[]
        in: query
        description: Series selector(s) to restrict the label value results.
        schema:
          type: array
          items:
            type: string
      - $ref: '#/components/parameters/Limit'
      responses:
        '200':
          description: Label values returned successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/StringListResponse'
        '400':
          description: Bad request
        '404':
          description: Label not found
  /api/v1/series:
    get:
      operationId: querySeries
      summary: Prometheus Query series
      description: Returns the list of time series that match a certain label set. The response contains the label sets identifying each time series. At least one match[] selector must be provided.
      tags:
      - Metadata
      parameters:
      - name: match[]
        in: query
        required: true
        description: Series selector(s). At least one required.
        schema:
          type: array
          items:
            type: string
      - name: start
        in: query
        description: Start of the time range filter.
        schema:
          type: string
      - name: end
        in: query
        description: End of the time range filter.
        schema:
          type: string
      - $ref: '#/components/parameters/Limit'
      responses:
        '200':
          description: Series returned successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SeriesResponse'
        '400':
          description: Bad request
  /api/v1/metadata:
    get:
      operationId: getMetricMetadata
      summary: Prometheus Get metric metadata
      description: Returns metadata about metrics currently scraped from targets. Metadata includes the metric type (counter, gauge, histogram, summary, untyped) and help string. Multiple targets may provide metadata for the same metric.
      tags:
      - Metadata
      parameters:
      - $ref: '#/components/parameters/Limit'
      - name: metric
        in: query
        description: Metric name to filter by. If omitted, all metrics are returned.
        schema:
          type: string
      - name: limit_per_metric
        in: query
        description: Maximum number of metadata entries to return per metric.
        schema:
          type: integer
      responses:
        '200':
          description: Metric metadata returned successfully
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MetricMetadataResponse'
        '400':
          description: Bad request
components:
  schemas:
    SeriesResponse:
      type: object
      description: Response containing a list of series label sets.
      required:
      - status
      - data
      properties:
        status:
          type: string
          enum:
          - success
          - error
        data:
          type: array
          items:
            type: object
            additionalProperties:
              type: string
          description: List of label sets, each identifying a matching time series.
    StringListResponse:
      type: object
      description: Response containing a list of string values.
      required:
      - status
      - data
      properties:
        status:
          type: string
          enum:
          - success
          - error
        data:
          type: array
          items:
            type: string
          description: List of string values.
        warnings:
          type: array
          items:
            type: string
    MetricMetadataResponse:
      type: object
      description: Response containing metadata for metrics.
      required:
      - status
      - data
      properties:
        status:
          type: string
          enum:
          - success
          - error
        data:
          type: object
          description: Map of metric names to arrays of metadata entries.
          additionalProperties:
            type: array
            items:
              type: object
              properties:
                type:
                  type: string
                  enum:
                  - counter
                  - gauge
                  - histogram
                  - gaugehistogram
                  - summary
                  - untyped
                  description: Metric type.
                help:
                  type: string
                  description: Help text for the metric.
                unit:
                  type: string
                  description: Unit of the metric.
  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/