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polish TraceQL service docs #13804

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4 changes: 3 additions & 1 deletion docs/en/api/traceql-service.md
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Expand Up @@ -3,7 +3,9 @@ TraceQL ([Trace Query Language](https://grafana.com/docs/tempo/latest/traceql/))
TraceQL Service exposes Tempo Querying HTTP APIs including TraceQL expression system and OpenTelemetry Protocol (OTLP) trace format.
Third-party systems or visualization platforms that already support Tempo and TraceQL (such as Grafana), could obtain traces through TraceQL Service.

SkyWalking supports two types of traces: SkyWalking native traces and Zipkin-compatible traces. The TraceQL Service converts both trace formats to OpenTelemetry Protocol (OTLP) format to provide compatibility with Grafana Tempo and TraceQL queries.
SkyWalking supports two types of traces: SkyWalking native traces and Zipkin-compatible traces. The TraceQL Service converts both trace formats to [Tempo's format](https://github.com/grafana/tempo/blob/main/pkg/tempopb/tempo.proto)
to provide compatibility with Grafana Tempo and TraceQL queries. Since the trace detail part of Tempo's format (`Trace` message) reuses [OTLP Trace](https://opentelemetry.io/docs/reference/specification/protocol/) definitions,
the conversion descriptions below refer to OTLP field names (e.g., span kind, status code).

> **Note**: SkyWalking native trace support in TraceQL is based on the [Query Traces V2 API](https://skywalking.apache.org/docs/main/next/en/api/query-protocol/#trace-v2) (`queryTraces` / `hasQueryTracesV2Support`).
> Currently, only **BanyanDB** storage implements this API. Other storage backends (e.g. Elasticsearch, MySQL, PostgreSQL) do not support it.
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