wu-sheng commented on code in PR #12342:
URL: https://github.com/apache/skywalking/pull/12342#discussion_r1643907119
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docs/en/debugging/query-tracing.md:
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@@ -0,0 +1,170 @@
+# The OAP Query Tracing
+SkyWalking OAP provides the query tracing service to help users to debug and
diagnose the query performance for the SkyWalking backend self.
+
+## Tracing Structure
+- Trace
+
+| Field | Description |
+|-----------|-------------------------------------------------|
+| traceId | The unique ID of the trace |
+| condition | The query conditions |
+| startTime | The start time of the trace. In nanoseconds |
+| endTime | The end time of the trace. In nanoseconds |
+| duration | The operation name of the trace. in nanoseconds |
+| spans | spans in this trace |
+
+- Span
+
+| Field | Description
|
+|--------------|------------------------------------------------------------------------------------------------------------------|
+| spanId | The unique ID of the span
|
+| parentSpanId | The parent span ID of the span
|
+| operation | The operation name of the span
|
+| startTime | The start time of the span. In nanoseconds
|
+| endTime | The end time of the span. In nanoseconds
|
+| duration | The duration of the span. In nanoseconds
|
+| msg | The message of the span, could include additional info such
as request condition and response from the Database |
+| error | The error message of the span, if the span has an error.
|
+
+
+## MQE Query Tracing
+MQE query tracing used to trace the query performance of the MQE query.
+
+### Debugging HTTP Service
Review Comment:
We should add another part `Debugging with GraphQL bundled` to introduce the
new flag and response in the metrics v3 query.
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