arazzo: 1.0.1
info:
  title: New Relic Host Metric Drilldown
  summary: Resolve an app, pick a host, list its metric names, and pull metric data.
  description: >-
    A drilldown pattern for inspecting a single host. The workflow resolves an
    application by name, lists its hosts to select one, enumerates the metric
    names available on that host, and then retrieves data for those metrics.
    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: newRelicApi
  url: ../openapi/new-relic-openapi.yml
  type: openapi
workflows:
- workflowId: host-metric-drilldown
  summary: Drill from an app to a host to its metric data.
  description: >-
    Resolves the application id by name, selects a host from the application's
    host list, lists the metric names on that host, and retrieves metric data
    for the requested names.
  inputs:
    type: object
    required:
    - applicationName
    - metricNames
    properties:
      applicationName:
        type: string
        description: The exact name of the application to drill into.
      metricNames:
        type: array
        items:
          type: string
        description: The metric names to retrieve data for on the selected host.
  steps:
  - stepId: resolveApplication
    description: Resolve the application id by exact name.
    operationId: getApplications
    parameters:
    - name: filter[name]
      in: query
      value: $inputs.applicationName
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      applicationId: $response.body#/application/id
  - stepId: listHosts
    description: >-
      List the application's hosts and capture the first host id to drill into.
    operationId: getApplicationsIdHosts
    parameters:
    - name: application_id
      in: path
      value: $steps.resolveApplication.outputs.applicationId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      hostId: $response.body#/application_hosts/0/id
  - stepId: listHostMetrics
    description: >-
      List the metric names available on the selected host so the caller can see
      what is measurable before requesting data.
    operationId: getApplicationsIdHostsHostIdMetrics
    parameters:
    - name: application_id
      in: path
      value: $steps.resolveApplication.outputs.applicationId
    - name: host_id
      in: path
      value: $steps.listHosts.outputs.hostId
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      metrics: $response.body#/metrics
  - stepId: getHostMetricData
    description: >-
      Retrieve summarized metric data for the requested metric names on the
      selected host.
    operationId: getApplicationsIdHostsHostIdMetricsData
    parameters:
    - name: application_id
      in: path
      value: $steps.resolveApplication.outputs.applicationId
    - name: host_id
      in: path
      value: $steps.listHosts.outputs.hostId
    - name: names
      in: query
      value: $inputs.metricNames
    - name: summarize
      in: query
      value: true
    successCriteria:
    - condition: $statusCode == 200
    outputs:
      metricData: $response.body#/metric_data
  outputs:
    applicationId: $steps.resolveApplication.outputs.applicationId
    hostId: $steps.listHosts.outputs.hostId
    metricData: $steps.getHostMetricData.outputs.metricData