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Added docs related to traceid string; fixes gh-998

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Marcin Grzejszczak
2018-06-04 08:47:17 +02:00
parent 0f06e1e425
commit fa054850ff
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docs/src/main/asciidoc/spring-cloud-sleuth.adoc
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@@ -480,6 +480,11 @@ Instead, look them up each time you need them.
Brave supports a "`current span`" concept which represents the in-flight operation.
You can use `Tracer.currentSpan()` to add custom tags to a span and `Tracer.nextSpan()` to create a child of whatever is in-flight.
In Sleuth, you can autowire the `Tracer` bean to retrieve the current span via
`tracer.currentSpan()` method. To retrieve the current context just call
`tracer.currentSpan().context()`. To get the current trace id as String
you can use the `traceIdString()` method like this: `tracer.currentSpan().context().traceIdString()`.
=== Setting a span in scope manually
When writing new instrumentation, it is important to place a span you created in scope as the current span.