openapi: 3.0.3
info:
  title: Thanos Query API
  description: >-
    The Thanos Query API provides a Prometheus-compatible HTTP API for querying
    metrics across multiple Prometheus servers and long-term storage backends.
    Thanos Query implements the full Prometheus v1 API surface, enabling a global
    query view with deduplication across replicated series.
  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
externalDocs:
  description: Thanos Documentation
  url: https://thanos.io/tip/components/query.md/
servers:
  - url: http://localhost:9090
    description: Default Thanos Query HTTP endpoint
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'
  /api/v1/series:
    get:
      operationId: getSeries
      summary: Find Series by Label Matchers
      description: >-
        Returns the list of time series that match a certain label set. Queries
        across all connected stores.
      tags:
        - Metadata
      parameters:
        - name: match[]
          in: query
          required: true
          description: >-
            Series selector argument that selects the series to return. At least
            one match[] argument must be provided.
          schema:
            type: array
            items:
              type: string
          style: form
          explode: true
        - name: start
          in: query
          required: false
          description: Start timestamp
          schema:
            type: string
        - name: end
          in: query
          required: false
          description: End timestamp
          schema:
            type: string
        - $ref: '#/components/parameters/dedup'
        - $ref: '#/components/parameters/partial_response'
      responses:
        '200':
          description: Successful series lookup
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/SeriesResponse'
        '400':
          description: Invalid parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /api/v1/labels:
    get:
      operationId: getLabels
      summary: Get Label Names
      description: Returns a list of label names available across all stores.
      tags:
        - Metadata
      parameters:
        - name: start
          in: query
          required: false
          description: Start timestamp
          schema:
            type: string
        - name: end
          in: query
          required: false
          description: End timestamp
          schema:
            type: string
        - name: match[]
          in: query
          required: false
          description: Series selector to filter labels
          schema:
            type: array
            items:
              type: string
          style: form
          explode: true
        - $ref: '#/components/parameters/partial_response'
      responses:
        '200':
          description: Successful label names response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LabelsResponse'
        '400':
          description: Invalid parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /api/v1/label/{label_name}/values:
    get:
      operationId: getLabelValues
      summary: Get Label Values
      description: >-
        Returns a list of label values for a given label name across all
        connected stores.
      tags:
        - Metadata
      parameters:
        - name: label_name
          in: path
          required: true
          description: The label name to retrieve values for
          schema:
            type: string
        - name: start
          in: query
          required: false
          description: Start timestamp
          schema:
            type: string
        - name: end
          in: query
          required: false
          description: End timestamp
          schema:
            type: string
        - name: match[]
          in: query
          required: false
          description: Series selector to filter label values
          schema:
            type: array
            items:
              type: string
          style: form
          explode: true
        - $ref: '#/components/parameters/partial_response'
      responses:
        '200':
          description: Successful label values response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/LabelValuesResponse'
        '400':
          description: Invalid parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ErrorResponse'
  /api/v1/targets:
    get:
      operationId: getTargets
      summary: Get Current Target Discovery
      description: >-
        Returns an overview of the current state of target discovery across
        connected Prometheus instances.
      tags:
        - Targets
      parameters:
        - name: state
          in: query
          required: false
          description: >-
            Filter targets by state. Can be active, dropped, or any.
          schema:
            type: string
            enum:
              - active
              - dropped
              - any
        - $ref: '#/components/parameters/partial_response'
      responses:
        '200':
          description: Successful targets response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TargetsResponse'
  /api/v1/rules:
    get:
      operationId: getRules
      summary: Get Alerting and Recording Rules
      description: >-
        Returns a list of alerting and recording rules that are currently loaded
        across connected Thanos Ruler and Prometheus instances.
      tags:
        - Rules
      parameters:
        - name: type
          in: query
          required: false
          description: Filter by rule type
          schema:
            type: string
            enum:
              - alert
              - record
        - name: match[]
          in: query
          required: false
          description: Filter rules by label matchers
          schema:
            type: array
            items:
              type: string
          style: form
          explode: true
        - $ref: '#/components/parameters/partial_response'
      responses:
        '200':
          description: Successful rules response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/RulesResponse'
  /api/v1/alerts:
    get:
      operationId: getAlerts
      summary: Get Active Alerts
      description: >-
        Returns a list of all active alerts across connected Thanos Ruler and
        Prometheus instances.
      tags:
        - Rules
      parameters:
        - $ref: '#/components/parameters/partial_response'
      responses:
        '200':
          description: Successful alerts response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/AlertsResponse'
  /api/v1/stores:
    get:
      operationId: getStores
      summary: Get Connected Store Information
      description: >-
        Returns information about all connected Thanos store endpoints including
        their type, labels, min/max time range, and last health check status.
        This is a Thanos-specific endpoint not found in vanilla Prometheus.
      tags:
        - Stores
      responses:
        '200':
          description: Successful stores response
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/StoresResponse'
components:
  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
    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
    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
  schemas:
    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
    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
    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
    ScalarResult:
      type: array
      description: '[timestamp, value] pair for scalar results'
      items: {}
      minItems: 2
      maxItems: 2
    SeriesResponse:
      type: object
      required:
        - status
        - data
      properties:
        status:
          type: string
          enum:
            - success
        data:
          type: array
          items:
            type: object
            additionalProperties:
              type: string
          description: Array of label sets
        warnings:
          type: array
          items:
            type: string
    LabelsResponse:
      type: object
      required:
        - status
        - data
      properties:
        status:
          type: string
          enum:
            - success
        data:
          type: array
          items:
            type: string
          description: List of label names
        warnings:
          type: array
          items:
            type: string
    LabelValuesResponse:
      type: object
      required:
        - status
        - data
      properties:
        status:
          type: string
          enum:
            - success
        data:
          type: array
          items:
            type: string
          description: List of label values
        warnings:
          type: array
          items:
            type: string
    TargetsResponse:
      type: object
      required:
        - status
        - data
      properties:
        status:
          type: string
          enum:
            - success
        data:
          type: object
          properties:
            activeTargets:
              type: array
              items:
                $ref: '#/components/schemas/ActiveTarget'
            droppedTargets:
              type: array
              items:
                $ref: '#/components/schemas/DroppedTarget'
    ActiveTarget:
      type: object
      properties:
        discoveredLabels:
          type: object
          additionalProperties:
            type: string
        labels:
          type: object
          additionalProperties:
            type: string
        scrapePool:
          type: string
        scrapeUrl:
          type: string
        globalUrl:
          type: string
        lastError:
          type: string
        lastScrape:
          type: string
          format: date-time
        lastScrapeDuration:
          type: number
          format: double
        health:
          type: string
          enum:
            - up
            - down
            - unknown
    DroppedTarget:
      type: object
      properties:
        discoveredLabels:
          type: object
          additionalProperties:
            type: string
    RulesResponse:
      type: object
      required:
        - status
        - data
      properties:
        status:
          type: string
          enum:
            - success
        data:
          type: object
          properties:
            groups:
              type: array
              items:
                $ref: '#/components/schemas/RuleGroup'
    RuleGroup:
      type: object
      properties:
        name:
          type: string
        file:
          type: string
        interval:
          type: number
          format: double
        rules:
          type: array
          items:
            oneOf:
              - $ref: '#/components/schemas/AlertingRule'
              - $ref: '#/components/schemas/RecordingRule'
        partialResponseStrategy:
          type: string
          description: Thanos-specific field for partial response handling
    AlertingRule:
      type: object
      properties:
        type:
          type: string
          enum:
            - alerting
        name:
          type: string
        query:
          type: string
        duration:
          type: number
          format: double
        labels:
          type: object
          additionalProperties:
            type: string
        annotations:
          type: object
          additionalProperties:
            type: string
        alerts:
          type: array
          items:
            $ref: '#/components/schemas/Alert'
        health:
          type: string
        lastError:
          type: string
        lastEvaluation:
          type: string
          format: date-time
        evaluationTime:
          type: number
          format: double
        state:
          type: string
          enum:
            - firing
            - pending
            - inactive
    RecordingRule:
      type: object
      properties:
        type:
          type: string
          enum:
            - recording
        name:
          type: string
        query:
          type: string
        labels:
          type: object
          additionalProperties:
            type: string
        health:
          type: string
        lastError:
          type: string
        lastEvaluation:
          type: string
          format: date-time
        evaluationTime:
          type: number
          format: double
    AlertsResponse:
      type: object
      required:
        - status
        - data
      properties:
        status:
          type: string
          enum:
            - success
        data:
          type: object
          properties:
            alerts:
              type: array
              items:
                $ref: '#/components/schemas/Alert'
    Alert:
      type: object
      properties:
        labels:
          type: object
          additionalProperties:
            type: string
        annotations:
          type: object
          additionalProperties:
            type: string
        state:
          type: string
          enum:
            - firing
            - pending
        activeAt:
          type: string
          format: date-time
        value:
          type: string
    StoresResponse:
      type: object
      required:
        - status
        - data
      properties:
        status:
          type: string
          enum:
            - success
        data:
          type: array
          items:
            $ref: '#/components/schemas/StoreInfo'
    StoreInfo:
      type: object
      properties:
        name:
          type: string
          description: Store endpoint name or address
        lastCheck:
          type: string
          format: date-time
          description: Timestamp of last health check
        lastError:
          type: string
          nullable: true
          description: Last error from the store, null if healthy
        labelSets:
          type: array
          items:
            type: object
            additionalProperties:
              type: string
          description: External labels advertised by the store
        minTime:
          type: integer
          format: int64
          description: Minimum time in milliseconds the store has data for
        maxTime:
          type: integer
          format: int64
          description: Maximum time in milliseconds the store has data for
        storeType:
          type: string
          description: Type of store component
          enum:
            - sidecar
            - store
            - rule
            - receive
            - debug
            - unknown
    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