Grafana Query a Data Source Through Grafana

arazzo: 1.0.1
info:
  title: Grafana Query a Data Source Through Grafana
  summary: Resolve a data source by name, then run a time-range query against it via Grafana's query endpoint.
  description: >-
    Grafana is not only a place to draw graphs; it is a proxy that already holds
    every credential and every data source URL you would otherwise have to
    duplicate. Querying through Grafana means an agent or a script asks one
    endpoint, with one token, for data from Prometheus, Loki, or a SQL database
    alike. This workflow resolves the data source by its human name to get the
    UID the query needs, then posts the query. The query model itself is
    datasource-specific and is passed through by Grafana unchanged. Every step
    spells out its request inline so the flow can be read and executed without
    opening the underlying OpenAPI description.
  version: 1.0.0
sourceDescriptions:
- name: grafanaApi
  url: ../openapi/grafana-openapi.yml
  type: openapi
workflows:
- workflowId: query-datasource
  summary: Run a query against a named Grafana data source over a relative time range.
  description: >-
    Looks the data source up by name to get its UID and type, then submits a
    query for the requested time range through Grafana's shared query endpoint.
  inputs:
    type: object
    required:
    - datasourceName
    - query
    properties:
      datasourceName:
        type: string
        description: Name of the data source as it appears in Grafana (e.g. "Prometheus - Prod").
      query:
        type: object
        description: >-
          The datasource-specific query model, minus the datasource and refId
          fields which this workflow fills in (e.g. {"expr": "up", "instant":
          true} for Prometheus, {"rawSql": "select 1"} for a SQL source).
      from:
        type: string
        description: >-
          Start of the query range, as epoch milliseconds or a relative
          expression like "now-6h".
        default: now-6h
      to:
        type: string
        description: End of the query range, as epoch milliseconds or "now".
        default: now
      maxDataPoints:
        type: integer
        description: Upper bound on points returned per series.
        default: 1000
      intervalMs:
        type: integer
        description: Suggested step between points, in milliseconds.
        default: 60000
      debug:
        type: boolean
        description: Ask Grafana to include debugging detail in the response.
        default: false
  steps:
  - stepId: resolveDataSource
    description: >-
      Resolve the data source by name. The query endpoint addresses sources by
      UID, and UIDs differ between instances while names usually do not, so
      resolving here keeps the workflow portable across dev and prod.
    operationId: getDataSourceByName
    parameters:
    - name: name
      in: path
      value: $inputs.datasourceName
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      datasourceUid: $response.body#/uid
      datasourceType: $response.body#/type
      datasourceId: $response.body#/id
  - stepId: runQuery
    description: >-
      Submit the query through Grafana, which proxies it to the data source using
      the credentials it already holds. The caller never sees or handles the
      backend's credentials.
    operationId: queryMetricsWithExpressions
    requestBody:
      contentType: application/json
      payload:
        from: $inputs.from
        to: $inputs.to
        debug: $inputs.debug
        queries:
        - refId: A
          datasource:
            uid: $steps.resolveDataSource.outputs.datasourceUid
            type: $steps.resolveDataSource.outputs.datasourceType
          datasourceId: $steps.resolveDataSource.outputs.datasourceId
          maxDataPoints: $inputs.maxDataPoints
          intervalMs: $inputs.intervalMs
          model: $inputs.query
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      results: $response.body#/results
      frames: $response.body#/results/A/frames
  outputs:
    datasourceUid: $steps.resolveDataSource.outputs.datasourceUid
    datasourceType: $steps.resolveDataSource.outputs.datasourceType
    results: $steps.runQuery.outputs.results