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Deadlock when using Prometheus Exemplars #40972

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@anvo1115

Description

@anvo1115

It seems that the issue #33070 is reproduced again.

We use

[INFO] +- org.springframework.boot:spring-boot-starter-actuator:jar:3.2.4:compile
[INFO] |  +- org.springframework.boot:spring-boot-actuator-autoconfigure:jar:3.2.4:compile
[INFO] |  +- io.micrometer:micrometer-observation:jar:1.12.4:compile
[INFO] |  |  \- io.micrometer:micrometer-commons:jar:1.12.4:compile
[INFO] |  \- io.micrometer:micrometer-jakarta9:jar:1.12.4:compile

and it seems that https://github.com/spring-projects/spring-boot/blob/v3.2.4/spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/tracing/prometheus/PrometheusExemplarsAutoConfiguration.java causes a deadllock.

Please, refer to the attached thread dump.
thread_dump_with_deadlock.txt

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