import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';

system.opentelemetry_span_log

Contains information about trace spans for executed queries.

Columns:

• trace_id (UUID) — ID of the trace for executed query.
• span_id (UInt64) — ID of the trace span.
• parent_span_id (UInt64) — ID of the parent trace span.
• operation_name (String) — The name of the operation.
• kind (Enum8) — The SpanKind of the span.
  • INTERNAL — Indicates that the span represents an internal operation within an application.
  • SERVER — Indicates that the span covers server-side handling of a synchronous RPC or other remote request.
  • CLIENT — Indicates that the span describes a request to some remote service.
  • PRODUCER — Indicates that the span describes the initiators of an asynchronous request. This parent span will often end before the corresponding child CONSUMER span, possibly even before the child span starts.
  • CONSUMER - Indicates that the span describes a child of an asynchronous PRODUCER request.
• start_time_us (UInt64) — The start time of the trace span (in microseconds).
• finish_time_us (UInt64) — The finish time of the trace span (in microseconds).
• finish_date (Date) — The finish date of the trace span.
• status_code (Enum8) — The status code of the span.
• status_message (String) — Error message associated with the span, if any. Empty when status_code is not ERROR.
• attribute.names (Array(String)) — Attribute names depending on the trace span. They are filled in according to the recommendations in the OpenTelemetry standard.
• attribute.values (Array(String)) — Attribute values depending on the trace span. They are filled in according to the recommendations in the OpenTelemetry standard.

Example

Query:

SELECT * FROM system.opentelemetry_span_log LIMIT 1 FORMAT Vertical;

Result:

Row 1:
──────
trace_id:         cdab0847-0d62-61d5-4d38-dd65b19a1914
span_id:          701487461015578150
parent_span_id:   2991972114672045096
operation_name:   DB::Block DB::InterpreterSelectQuery::getSampleBlockImpl()
kind:             INTERNAL
start_time_us:    1612374594529090
finish_time_us:   1612374594529108
finish_date:      2021-02-03
attribute.names:  []
attribute.values: []

See Also

• OpenTelemetry