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Configure automatic context propagation for Reactor

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This commit adds a new configuration property,
`spring.reactor.context-propagation` that configures the context
propagation mode for Reactor operators. By default the value is set to
"AUTO" for reinstating automatically context values as ThreadLocals
within Reactor operators. The "LIMITED" mode restricts this feature ot
the "tap" and "handle" operators but has a slightly lower footprint.

Closes gh-34201
This commit is contained in:
Brian Clozel
2023-02-20 10:22:57 +01:00
parent bf15797014
commit 4da42c09a6
7 changed files with 190 additions and 0 deletions
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spring-boot-project/spring-boot-docs/src/docs/asciidoc/actuator/observability.adoc
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@@ -21,4 +21,7 @@ For JDBC, the https://github.com/jdbc-observations/datasource-micrometer[Datasou
Read more about it https://jdbc-observations.github.io/datasource-micrometer/docs/current/docs/html/[in the reference documentation].
For R2DBC, the https://github.com/spring-projects-experimental/r2dbc-micrometer-spring-boot[Spring Boot Auto Configuration for R2DBC Observation] creates observations for R2DBC query invocations.
Observability support relies on the https://github.com/micrometer-metrics/context-propagation[Context Propagation library] for forwarding the current observation across threads and reactive pipelines.
`ThreadLocal` values are automatically reinstated in reactive operators, this behavior is controlled with the configprop:spring.reactor.context-propagation[] property.
The next sections will provide more details about logging, metrics and traces.