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Torch Log Service

Tracing service

Trace data format

Torch Log Service(TLS) is compatible with the OpenTelemetry-defined data format. This topic describes the defined fields that are used when collecting trace data.

After collecting and writing trace data to TLS, the trace data is stored in the specified log topic as structured key-value pairs, with field indexing enabled. The trace data fields defined by TLS are described as follows.

Tip

The trace data format in TLS is fully compatible with the standard data format of the OpenTelemetry protocol. Trace data written via the OpenTelemetry protocol can be automatically mapped to OpenTelemetry's trace data format.

TLS field	Data type	Example value	Description
Name	String	Poll	Span name
TraceID	String	e29a0a64fd256081ad57e983d260xxxx	Trace ID of the span, in hexadecimal format.
SpanID	String	198b93e4fc50xxxx	Span ID, in hexadecimal format
TraceState	String	lasterror=f39cd56cc44274fd5abd07ef1164246d10cexxxx	(optional) Custom key-value pairs.
ParentSpanID	String	198b93e4fc50xxxx	Parent SpanID of the current Span. The ParentSpanID of the first Span is empty
Kind	String	SERVER	Span type, such as SERVER or CLIENT.
Start	Integer	1683032165241	Span start time. Unix timestamp type, measured in milliseconds.
End	Integer	1683032220248	Span end time. Unix timestamp type, measured in milliseconds.
Duration	Integer	55007	Span duration—the difference between start time and end time. It is measured in milliseconds.
Attributes	JSON	{"component": "net/http", "http.method": "GET", "http.status_code": 200, "http.url": "0.0.0.0:8083", "net/http.reused": true, “net/http.was_idle”: true}	Attribute information of span. For details, see Attribute Naming
Events	JSON	[ { "Attributes": { "event": "GetConn" }, "Name": "", "Time": 1684420552720997000 }, { "Attributes": { "event": "ClosedBody" }, "Name": "", "Time": 1684420552786987000 } ]	Span-related event information in JSON string format
Links	JSON	[{"TraceID" : "e29a0a64fd256081ad57e983d260**", "SpanId" : "198b93e4fc50**", "TraceState" : "Client", "Attributes" : {} }]	Other associated spans. It is in JSON string format.
StatusCode	String	OK	Status code, including OK, ERROR, or UNSET.
StatusDescription	String	Success	Description of the status.
Resource	JSON	{"environment":"demo","service.name":"fib","service.version":"v0.1.0","telemetry.sdk.language":"go","telemetry.sdk.name":"opentelemetry","telemetry.sdk.version":"1.11.0"}	Resource field. For details, see Resource Semantic Conventions.
ServiceName	String	TLS_OTEL_SERVICE	Service name where the span originated. That is, the service.name from resource.
Host	String	localhost	The hostname where the span comes from, i.e., the host.name from resource.
OTLPName	String	opentelemetry	Name of the trace SDK.
OTLPVersion	String	1.11.0	Trace SDK version number.

Last updated: 2026.07.27 14:20:12