openapi: 3.1.0
info:
  title: OpenTelemetry Protocol (OTLP) HTTP Traces API
  description: The OpenTelemetry Protocol (OTLP) HTTP API provides endpoints for receiving telemetry data including traces, metrics, and logs. OTLP is the native protocol for OpenTelemetry and defines how telemetry data is encoded, transported, and delivered between telemetry sources, collectors, and backends.
  version: 1.0.0
  contact:
    name: OpenTelemetry
    url: https://opentelemetry.io
  license:
    name: Apache 2.0
    url: https://www.apache.org/licenses/LICENSE-2.0
servers:
- url: http://localhost:4318
  description: Default OTLP HTTP receiver endpoint
tags:
- name: Traces
paths:
  /v1/traces:
    post:
      operationId: exportTraces
      summary: OpenTelemetry Export trace data
      description: Accepts a batch of spans encoded in OTLP format. Each span represents a unit of work or operation within a distributed trace, containing timing data, attributes, events, and links.
      tags:
      - Traces
      requestBody:
        required: true
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/ExportTraceServiceRequest'
          application/x-protobuf:
            schema:
              type: string
              format: binary
      responses:
        '200':
          description: Successfully accepted trace data
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/ExportTraceServiceResponse'
        '400':
          description: Bad request - malformed payload
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Status'
        '429':
          description: Too many requests - rate limited
          headers:
            Retry-After:
              schema:
                type: integer
              description: Seconds to wait before retrying
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Status'
        '503':
          description: Service unavailable
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/Status'
components:
  schemas:
    ScopeSpans:
      type: object
      description: Spans associated with an instrumentation scope
      properties:
        scope:
          $ref: '#/components/schemas/InstrumentationScope'
        spans:
          type: array
          description: List of spans
          items:
            $ref: '#/components/schemas/Span'
        schemaUrl:
          type: string
          description: Schema URL for the instrumentation scope
    InstrumentationScope:
      type: object
      description: Metadata about the instrumentation library or component that produced the telemetry data.
      properties:
        name:
          type: string
          description: Instrumentation scope name
        version:
          type: string
          description: Instrumentation scope version
        attributes:
          type: array
          description: Scope attributes
          items:
            $ref: '#/components/schemas/KeyValue'
        droppedAttributesCount:
          type: integer
          format: int32
    ExportTraceServiceResponse:
      type: object
      description: Response message for the trace export service
      properties:
        partialSuccess:
          $ref: '#/components/schemas/ExportTracePartialSuccess'
    ExportTraceServiceRequest:
      type: object
      description: Request message for the trace export service
      properties:
        resourceSpans:
          type: array
          description: Batch of resource spans
          items:
            $ref: '#/components/schemas/ResourceSpans'
    Span:
      type: object
      description: A span represents a single operation within a trace. Spans can be nested to form a trace tree. Each span has a name, timing data, structured log messages (events), and links to other spans.
      required:
      - traceId
      - spanId
      - name
      - kind
      - startTimeUnixNano
      - endTimeUnixNano
      properties:
        traceId:
          type: string
          description: Unique 16-byte trace identifier as 32 hex characters
          pattern: ^[a-f0-9]{32}$
        spanId:
          type: string
          description: Unique 8-byte span identifier as 16 hex characters
          pattern: ^[a-f0-9]{16}$
        traceState:
          type: string
          description: W3C trace state header value
        parentSpanId:
          type: string
          description: Span ID of the parent span (empty for root spans)
          pattern: ^[a-f0-9]{16}$
        flags:
          type: integer
          format: int32
          description: Trace flags as defined in W3C Trace Context
        name:
          type: string
          description: Human-readable name of the span
        kind:
          type: integer
          description: 'Span kind: 0=unspecified, 1=internal, 2=server, 3=client, 4=producer, 5=consumer'
          enum:
          - 0
          - 1
          - 2
          - 3
          - 4
          - 5
        startTimeUnixNano:
          type: string
          format: uint64
          description: Start time in nanoseconds since Unix epoch
        endTimeUnixNano:
          type: string
          format: uint64
          description: End time in nanoseconds since Unix epoch
        attributes:
          type: array
          description: Key-value pairs providing additional span context
          items:
            $ref: '#/components/schemas/KeyValue'
        droppedAttributesCount:
          type: integer
          format: int32
          description: Number of attributes dropped due to limits
        events:
          type: array
          description: Timed events associated with the span
          items:
            $ref: '#/components/schemas/SpanEvent'
        droppedEventsCount:
          type: integer
          format: int32
          description: Number of events dropped due to limits
        links:
          type: array
          description: Links to other spans in the same or different traces
          items:
            $ref: '#/components/schemas/SpanLink'
        droppedLinksCount:
          type: integer
          format: int32
          description: Number of links dropped due to limits
        status:
          $ref: '#/components/schemas/SpanStatus'
    Resource:
      type: object
      description: Describes the entity producing telemetry. A resource has attributes such as service.name, service.version, host.name, and other identifying metadata.
      properties:
        attributes:
          type: array
          description: Resource attributes
          items:
            $ref: '#/components/schemas/KeyValue'
        droppedAttributesCount:
          type: integer
          format: int32
    SpanEvent:
      type: object
      description: A timed event within a span
      properties:
        timeUnixNano:
          type: string
          format: uint64
          description: Event timestamp in nanoseconds since Unix epoch
        name:
          type: string
          description: Event name
        attributes:
          type: array
          description: Event attributes
          items:
            $ref: '#/components/schemas/KeyValue'
        droppedAttributesCount:
          type: integer
          format: int32
    AnyValue:
      type: object
      description: A polymorphic value container that can hold string, bool, int, double, array, or key-value list values.
      properties:
        stringValue:
          type: string
        boolValue:
          type: boolean
        intValue:
          type: string
          format: int64
        doubleValue:
          type: number
          format: double
        arrayValue:
          type: object
          properties:
            values:
              type: array
              items:
                $ref: '#/components/schemas/AnyValue'
        kvlistValue:
          type: object
          properties:
            values:
              type: array
              items:
                $ref: '#/components/schemas/KeyValue'
        bytesValue:
          type: string
          format: byte
    ResourceSpans:
      type: object
      description: Collection of spans from a resource
      properties:
        resource:
          $ref: '#/components/schemas/Resource'
        scopeSpans:
          type: array
          description: Spans grouped by instrumentation scope
          items:
            $ref: '#/components/schemas/ScopeSpans'
        schemaUrl:
          type: string
          description: Schema URL for the resource
    ExportTracePartialSuccess:
      type: object
      description: Indicates partial success when some spans were rejected
      properties:
        rejectedSpans:
          type: integer
          format: int64
          description: Number of spans rejected
        errorMessage:
          type: string
          description: Human-readable error message
    Status:
      type: object
      description: Error status response
      properties:
        code:
          type: integer
          description: HTTP status code
        message:
          type: string
          description: Human-readable error message
    KeyValue:
      type: object
      description: A key-value pair for attributes
      required:
      - key
      - value
      properties:
        key:
          type: string
          description: Attribute key
        value:
          $ref: '#/components/schemas/AnyValue'
    SpanLink:
      type: object
      description: A reference from one span to another
      properties:
        traceId:
          type: string
          description: Trace ID of the linked span
        spanId:
          type: string
          description: Span ID of the linked span
        traceState:
          type: string
          description: W3C trace state of the linked span
        attributes:
          type: array
          description: Link attributes
          items:
            $ref: '#/components/schemas/KeyValue'
        droppedAttributesCount:
          type: integer
          format: int32
        flags:
          type: integer
          format: int32
    SpanStatus:
      type: object
      description: Status of the span
      properties:
        message:
          type: string
          description: Human-readable status message
        code:
          type: integer
          description: 'Status code: 0=unset, 1=ok, 2=error'
          enum:
          - 0
          - 1
          - 2
  securitySchemes:
    bearerAuth:
      type: http
      scheme: bearer
      description: Bearer token authentication for secured OTLP endpoints