SpringCloud/spring-cloud-sleuth
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Add configuration to put baggage automatically to MDC

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with this change it's enough to set a property to automatically propagate a baggage key to MDC

fixes gh-1071
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Marcin Grzejszczak
2018-08-23 16:42:01 +02:00
parent 5b6a4f2767
commit 713544703a
5 changed files with 91 additions and 16 deletions
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docs/src/main/asciidoc/spring-cloud-sleuth.adoc
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@@ -420,6 +420,11 @@ There are two properties to achieve this.
With the `spring.sleuth.baggage-keys`, you set keys that get prefixed with `baggage-` for HTTP calls and `baggage_` for messaging.
You can also use the `spring.sleuth.propagation-keys` property to pass a list of prefixed keys that are whitelisted without any prefix.
In order to automatically set the baggage values to Slf4j's MDC, you have to set
the `spring.sleuth.log.slf4j.whitelisted-mdc-keys` property with a list of whitelisted
baggage keys. E.g. `spring.sleuth.log.slf4j.whitelisted-mdc-keys=foo` will set the value of the
`foo` baggage into MDC.
==== Extracting a Propagated Context
The `TraceContext.Extractor<C>` reads trace identifiers and sampling status from an incoming request or message.