Update to Spring Boot 3

[BlacCello]

As an user or developer of the observability stack, I want to have up-to-date software to have a maintainable and secure software running.

Acceptance Criteria

• Spring Boot has been updated to the latest v3 version
• Recommended Migrations have been applied

Developer Notes

https://github.com/spring-projects/spring-boot/wiki/Spring-Boot-3.0-Migration-Guide https://github.com/micrometer-metrics/tracing/wiki/Spring-Cloud-Sleuth-3.1-Migration-Guide

[anarakhmedov]

https://github.com/feature-creeps/observability-workshop/pull/136

[GCP28]

I tested the observability stacks functionality and these were my findings.

PNG files:

• can't be flipped

JPG files:

• can't be flipped
• rotation does not work

There also seems to be a maximum to the allowed file size.

[BlacCello]

Imageflip was repaired, see https://github.com/feature-creeps/observability-workshop/commit/62e907314e77da3ec551558068a0b70601776384 Rotation for jpeg not working will be accepted as known bug for learning purposes

[BlacCello]

Traces of SB3 Services are not yet working in jaeger.