> ## Documentation Index > Fetch the complete documentation index at: https://docs.vos.verolabs.co/llms.txt > Use this file to discover all available pages before exploring further. # Latency detail records và timing segments > Latency detail records và timing segments ## OpenAPI ````yaml openapi.oms.vi.json GET /api/v1/util/latency/stages openapi: 3.0.3 info: title: VOS OMS Public API version: 1.0.0 description: >- Public REST API surface for Vero OMS. Authentication requests use platform.verolabs.co. REST API requests use api-oms.verolabs.co. servers: - url: https://platform.verolabs.co description: Authentication host - url: https://api-oms.verolabs.co description: REST API host security: [] tags: - name: Authentication description: Xác thực tài khoản và khôi phục mật khẩu. - name: Trading description: Order entry, quote, IOI, and trading activity APIs. - name: Portfolio & Risk description: Accounts, holdings, mappings, and risk-rule read APIs. - name: Administration description: Permissions, groups, workflow, reference data, and audit APIs. - name: System & Diagnostics description: Health and latency endpoints. paths: /api/v1/util/latency/stages: get: tags: - System & Diagnostics summary: Latency detail records and segments description: >- Returns matching latency detail records and derived per-segment latencies. When `request_id` is supplied without time parameters, the query uses the request identifier. Otherwise, the query uses the time window. Requires `Authorization: Bearer ` from `POST /api/auth/login`. Required JWT role: `admin`. operationId: get_api_v1_util_latency_stages parameters: - name: request_id in: query schema: type: string description: Request identifier. - $ref: '#/components/parameters/FromNs' - $ref: '#/components/parameters/ToNs' - $ref: '#/components/parameters/MessageType' - $ref: '#/components/parameters/Limit' - $ref: '#/components/parameters/Offset' responses: '200': description: Latency detail result content: application/json: schema: $ref: '#/components/schemas/LatencyDetailResult' '400': $ref: '#/components/responses/BadRequest' '500': $ref: '#/components/responses/ServerError' security: - bearerAuth: [] servers: - url: https://api-oms.verolabs.co components: parameters: FromNs: name: from_ns in: query description: Start of the time window as epoch nanoseconds. schema: type: integer format: int64 ToNs: name: to_ns in: query description: End of the time window as epoch nanoseconds. schema: type: integer format: int64 MessageType: name: message_type in: query schema: type: string description: Optional message type filter. Limit: name: limit in: query description: Page size. Defaults to 200; capped by the per-API max limit. schema: type: integer minimum: 1 Offset: name: offset in: query schema: type: integer minimum: 0 description: Zero-based number of records to skip. schemas: LatencyDetailResult: type: object properties: request_id: type: string description: Request identifier. from_time: type: integer format: int64 description: Start of the response time window in epoch nanoseconds. to_time: type: integer format: int64 description: End of the response time window in epoch nanoseconds. message_type: type: string description: Message type filter or message type reported by the record. limit: type: integer description: Maximum number of records returned. offset: type: integer description: Zero-based number of records skipped before returning results. count: type: integer description: Number of records in the response page or aggregation. events: type: array items: $ref: '#/components/schemas/LatencyDetailRecord' description: Latency detail records returned for the current page. segments: type: array items: $ref: '#/components/schemas/LatencySegment' description: Latency segments returned for the current page. description: Latency detail response. LatencyDetailRecord: type: object properties: request_id: type: string description: Request identifier. message_type: type: string description: Message type filter or message type reported by the record. stage: type: string description: Timing step value. stage_time: type: integer format: int64 description: Timestamp for the timing step. service: type: string description: Status label reported by the payload. source_service: type: string description: Source identifier reported by the payload. source_sequence: type: integer format: int64 description: Source sequence number for ordering updates. client_id: type: string description: Client identifier reported by the record. hft_gateway: type: string description: Routing identifier reported in the payload. stream_id: type: integer description: Stream identifier reported by the record. status: type: string description: Status value returned by the API. description: Latency detail record. LatencySegment: type: object properties: from_stage: type: string description: Timing step where the latency segment starts. to_stage: type: string description: Timing step where the latency segment ends. from_time: type: integer format: int64 description: Start of the response time window in epoch nanoseconds. to_time: type: integer format: int64 description: End of the response time window in epoch nanoseconds. latency_ns: type: integer format: int64 description: Latency duration in nanoseconds. description: Derived latency segment. Error: type: object properties: error: type: string description: Machine-readable error code or error category. status: type: integer description: Status value returned by the API. description: Standard error response envelope. responses: BadRequest: description: Invalid parameters content: application/json: schema: $ref: '#/components/schemas/Error' ServerError: description: Server error content: application/json: schema: $ref: '#/components/schemas/Error' securitySchemes: bearerAuth: type: http scheme: bearer bearerFormat: JWT ````