openapi: 3.1.0
info:
  title: Thanos Compact Alerts Query API
  description: The Thanos Compact HTTP API provides operational endpoints for the Compactor component, which runs as a singleton process applying Prometheus compaction procedures to TSDB blocks stored in object storage. It performs downsampling at 5-minute and 1-hour resolutions and enforces retention policies to reduce long-term storage costs.
  version: 0.35.0
  contact:
    name: Thanos Community
    url: https://thanos.io/
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0
servers:
- url: http://localhost:10902
  description: Default Thanos Compact HTTP endpoint
tags:
- name: Query
paths:
  /api/v1/query:
    get:
      operationId: instantQuery
      summary: Evaluate an Instant Query
      description: Evaluates a PromQL expression at a single point in time. Supports deduplication and partial response controls specific to Thanos.
      tags:
      - Query
      parameters:
      - name: query
        in: query
        required: true
        description: PromQL query expression
        schema:
          type: string
      - name: time
        in: query
        required: false
        description: Evaluation timestamp in RFC3339 or Unix timestamp format. Defaults to current server time.
        schema:
          type: string
      - name: timeout
        in: query
        required: false
        description: Evaluation timeout. Defaults to server-configured timeout.
        schema:
          type: string
      - $ref: '#/components/parameters/dedup'
      - $ref: '#/components/parameters/partial_response'
      - $ref: '#/components/parameters/max_source_resolution'
      - $ref: '#/components/parameters/engine'
      responses:
        '200':
          description: Successful query result
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QueryResponse'
        '400':
          description: Invalid query or parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: Unprocessable expression
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '503':
          description: Unavailable or timeout
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
    post:
      operationId: instantQueryPost
      summary: Evaluate an Instant Query (POST)
      description: Evaluates a PromQL expression at a single point in time using POST body encoding for large queries.
      tags:
      - Query
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - query
              properties:
                query:
                  type: string
                  description: PromQL query expression
                time:
                  type: string
                  description: Evaluation timestamp
                timeout:
                  type: string
                  description: Evaluation timeout
                dedup:
                  type: boolean
                  description: Enable deduplication
                partial_response:
                  type: boolean
                  description: Enable partial response
                max_source_resolution:
                  type: string
                  description: Maximum source resolution
      responses:
        '200':
          description: Successful query result
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QueryResponse'
        '400':
          description: Invalid query or parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /api/v1/query_range:
    get:
      operationId: rangeQuery
      summary: Evaluate a Range Query
      description: Evaluates a PromQL expression over a range of time with a specified step interval. Returns a matrix of time series values.
      tags:
      - Query
      parameters:
      - name: query
        in: query
        required: true
        description: PromQL query expression
        schema:
          type: string
      - name: start
        in: query
        required: true
        description: Start timestamp in RFC3339 or Unix timestamp format
        schema:
          type: string
      - name: end
        in: query
        required: true
        description: End timestamp in RFC3339 or Unix timestamp format
        schema:
          type: string
      - name: step
        in: query
        required: true
        description: Query resolution step width as duration or float seconds
        schema:
          type: string
      - name: timeout
        in: query
        required: false
        description: Evaluation timeout
        schema:
          type: string
      - $ref: '#/components/parameters/dedup'
      - $ref: '#/components/parameters/partial_response'
      - $ref: '#/components/parameters/max_source_resolution'
      - $ref: '#/components/parameters/engine'
      responses:
        '200':
          description: Successful range query result
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QueryResponse'
        '400':
          description: Invalid query or parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
        '422':
          description: Unprocessable expression
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
    post:
      operationId: rangeQueryPost
      summary: Evaluate a Range Query (POST)
      description: Evaluates a PromQL range query using POST body encoding for large queries.
      tags:
      - Query
      requestBody:
        required: true
        content:
          application/x-www-form-urlencoded:
            schema:
              type: object
              required:
              - query
              - start
              - end
              - step
              properties:
                query:
                  type: string
                start:
                  type: string
                end:
                  type: string
                step:
                  type: string
                timeout:
                  type: string
                dedup:
                  type: boolean
                partial_response:
                  type: boolean
                max_source_resolution:
                  type: string
      responses:
        '200':
          description: Successful range query result
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/QueryResponse'
        '400':
          description: Invalid query or parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
components:
  schemas:
    MatrixResult:
      type: object
      properties:
        metric:
          type: object
          additionalProperties:
            type: string
          description: Label set identifying the metric
        values:
          type: array
          description: Array of [timestamp, value] pairs
          items:
            type: array
            items: {}
            minItems: 2
            maxItems: 2
    ErrorResponse:
      type: object
      required:
      - status
      - errorType
      - error
      properties:
        status:
          type: string
          enum:
          - error
        errorType:
          type: string
          description: Category of error
        error:
          type: string
          description: Human-readable error message
        warnings:
          type: array
          items:
            type: string
    VectorResult:
      type: object
      properties:
        metric:
          type: object
          additionalProperties:
            type: string
          description: Label set identifying the metric
        value:
          type: array
          description: '[timestamp, value] pair'
          items: {}
          minItems: 2
          maxItems: 2
    QueryResponse:
      type: object
      required:
      - status
      - data
      properties:
        status:
          type: string
          enum:
          - success
          - error
        data:
          type: object
          required:
          - resultType
          - result
          properties:
            resultType:
              type: string
              enum:
              - matrix
              - vector
              - scalar
              - string
            result:
              type: array
              description: Query result. Structure varies based on resultType.
              items:
                oneOf:
                - $ref: '#/components/schemas/VectorResult'
                - $ref: '#/components/schemas/MatrixResult'
                - $ref: '#/components/schemas/ScalarResult'
        warnings:
          type: array
          items:
            type: string
          description: Warnings from partial responses or store issues
    ScalarResult:
      type: array
      description: '[timestamp, value] pair for scalar results'
      items: {}
      minItems: 2
      maxItems: 2
  parameters:
    dedup:
      name: dedup
      in: query
      required: false
      description: If true, enables deduplication of time series from replicated Prometheus instances. Defaults to true.
      schema:
        type: boolean
        default: true
    partial_response:
      name: partial_response
      in: query
      required: false
      description: If true, enables partial response. If a store is unavailable, partial data will be returned with a warning instead of failing the query.
      schema:
        type: boolean
        default: false
    engine:
      name: engine
      in: query
      required: false
      description: Query engine to use. Thanos supports the default Prometheus engine and the Thanos engine for distributed execution.
      schema:
        type: string
        enum:
        - prometheus
        - thanos
    max_source_resolution:
      name: max_source_resolution
      in: query
      required: false
      description: Maximum source resolution to use for the query. Can be 0s, 5m, or 1h. Selects the appropriate downsampled data when available.
      schema:
        type: string
        default: 0s
        enum:
        - 0s
        - 5m
        - 1h
externalDocs:
  description: Thanos Compact Documentation
  url: https://thanos.io/tip/components/compact.md/