Tempo Tags API

openapi: 3.1.0
info:
  title: Grafana Tempo HTTP Health Tags API
  description: The Grafana Tempo HTTP API provides endpoints for querying distributed traces, searching spans with TraceQL, discovering tag keys and values, and generating metrics from trace data. Tempo is compatible with Jaeger, Zipkin, and OpenTelemetry trace ingestion and query protocols. The API runs on the Tempo HTTP port (default 3200).
  version: 2.x
  contact:
    name: Grafana Tempo Community
    url: https://community.grafana.com/c/grafana-tempo/
    email: tempo@grafana.com
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0
servers:
- url: http://localhost:3200
  description: Local Tempo instance (default)
- url: http://tempo:3200
  description: Kubernetes service endpoint
tags:
- name: Tags
  description: Discover tag keys and values in trace data
paths:
  /api/search/tags:
    get:
      operationId: listTagKeys
      summary: List Tag Keys
      description: Returns all tag keys (span attribute names) present in the trace data within the configured search window. Useful for building search UIs and TraceQL autocomplete.
      tags:
      - Tags
      parameters:
      - name: scope
        in: query
        required: false
        description: Attribute scope filter (span, resource, intrinsic)
        schema:
          type: string
          enum:
          - span
          - resource
          - intrinsic
      - name: start
        in: query
        required: false
        description: Unix epoch start time
        schema:
          type: integer
          format: int64
      - name: end
        in: query
        required: false
        description: Unix epoch end time
        schema:
          type: integer
          format: int64
      responses:
        '200':
          description: Tag keys returned
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TagKeysResult'
  /api/search/tag/{tagName}/values:
    get:
      operationId: listTagValues
      summary: List Tag Values
      description: Returns all distinct values for a specific tag key within the trace data. Used for building search filter dropdowns and TraceQL query autocomplete.
      tags:
      - Tags
      parameters:
      - name: tagName
        in: path
        required: true
        description: Tag key name to retrieve values for
        schema:
          type: string
        example: service.name
      - name: q
        in: query
        required: false
        description: TraceQL query context for filtering tag values
        schema:
          type: string
      - name: start
        in: query
        required: false
        description: Unix epoch start time
        schema:
          type: integer
          format: int64
      - name: end
        in: query
        required: false
        description: Unix epoch end time
        schema:
          type: integer
          format: int64
      responses:
        '200':
          description: Tag values returned
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/TagValuesResult'
components:
  schemas:
    TagValuesResult:
      type: object
      description: Distinct values for a tag key
      properties:
        tagValues:
          type: array
          items:
            type: object
            properties:
              type:
                type: string
              value:
                type: string
    TagKeysResult:
      type: object
      description: List of tag keys present in trace data
      properties:
        tagNames:
          type: array
          items:
            type: string
          example:
          - service.name
          - http.method
          - db.system
externalDocs:
  description: Grafana Tempo API Documentation
  url: https://grafana.com/docs/tempo/latest/api_docs/