openapi: 3.2.0
info:
  title: Datadog Metrics Metric Metadata API
  description: The Datadog Metrics API allows you to post metrics data to be graphed on Datadog dashboards, query metrics from any time period as timeseries or scalar values, and modify tag configurations for metrics. It also supports viewing tags and volumes for metrics. Metrics data is stored as time series and can be queried programmatically for analysis and visualization.
  version: v2
  contact:
    name: Datadog Support
    url: https://www.datadoghq.com/support/
  termsOfService: https://www.datadoghq.com/legal/terms/
servers:
- url: https://api.datadoghq.com
  description: Datadog API Production Server
security:
- apiKeyAuth: []
tags:
- name: Metric Meta Data
  description: View and manage metric metadata and active metrics
paths:
  /api/v1/metrics:
    get:
      operationId: listActiveMetrics
      summary: Datadog List Active Metrics
      description: Returns the list of actively reporting metric names for a given hour. Optionally filters by host and metric name prefix. Metrics are considered active if they reported at least one data point within the last 48 hours. Useful for metric discovery and auditing.
      tags:
      - Metric Meta Data
      parameters:
      - name: from
        in: query
        required: true
        description: POSIX timestamp (seconds) indicating the start of the time window to query active metrics
        schema:
          type: integer
          format: int64
        example: 42
      - name: host
        in: query
        required: false
        description: Filter metrics by the hostname that is actively reporting the metric
        schema:
          type: string
        example: example_value
      - name: tag_filter
        in: query
        required: false
        description: Filter metrics by tag key or key:value pair (e.g., env:prod)
        schema:
          type: string
        example: env:production
      responses:
        '200':
          description: Successful response with list of active metrics
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/MetricsListResponse'
        '400':
          description: Bad request - invalid or missing required parameters
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/APIErrorResponse'
        '401':
          description: Unauthorized - missing or invalid API key
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/APIErrorResponse'
        '403':
          description: Forbidden - insufficient permissions for this operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/APIErrorResponse'
      x-microcks-operation:
        delay: 0
        dispatcher: FALLBACK
components:
  schemas:
    MetricsListResponse:
      type: object
      description: Response containing the list of active metric names
      properties:
        from:
          type: string
          description: The start time of the active metrics query window as a Unix timestamp string
          example: example_value
        metrics:
          type: array
          description: The list of active metric names for the specified time window
          items:
            type: string
    APIErrorResponse:
      type: object
      description: Standard API error response returned for failed requests
      required:
      - errors
      properties:
        errors:
          type: array
          description: List of error messages describing the failure
          items:
            type: string
  securitySchemes:
    apiKeyAuth:
      type: apiKey
      in: header
      name: DD-API-KEY
      description: Datadog API key for authenticating requests. Obtain from the Datadog organization settings under API Keys.
externalDocs:
  description: Datadog Metrics API Documentation
  url: https://docs.datadoghq.com/api/latest/metrics/