Upgrade to Spring Boot 4 and apply required compatibility changes

[obiwan87]

No description provided.

[jonatan-ivanov]

Thank you for the PR but both the build and the DCO checks are failing.
Please try to run ./gradlew build locally and sign the commit.

[obiwan87]

Thank you for the PR but both the build and the DCO checks are failing. Please try to run ./gradlew build locally and sign the commit.

There you go :)

[natcza]

Hi! Michael told me GitHub is the way to say hello! Mission accomplished 😊
Have a nice coding time!
Greetings,
Natalia

[Jolly5]

Hi everyone!
I would certainly be glad if this library were updated to Spring Boot 4, but that would break support for Spring Boot 3, which may be undesirable.

In case the maintainers decide this upgrade is not currently wanted, there is a way to provide good forward support without fully committing to Spring Boot 4. Which is to make the PrometheusRSocketClientAutoConfiguration support both Spring Boot 3 and Spring Boot 4. Specifically, replace

@AutoConfigureAfter(PrometheusMetricsExportAutoConfiguration.class)

With

@AutoConfigureAfter(name={
    "org.springframework.boot.actuate.autoconfigure.metrics.export.prometheus.PrometheusMetricsExportAutoConfiguration" // Spring Boot 3
    "org.springframework.boot.micrometer.metrics.autoconfigure.export.prometheus.PrometheusMetricsExportAutoConfiguration" // Spring Boot 4
})

For me, a similar trick has made 2.0.0-RC1 compatible with Spring Boot 4.
Notify me if that solution is preferred, I will gladly make a pull request.

Best regards,
Jolly

[klopfdreh]

My bad I added a PR (#111) and then I saw that this was already handled here.

The issue between Spring Boot 3 and 4 is that you also need to ensure the tests are running and you need an additional dependency for that org.springframework.boot:spring-boot-micrometer-metrics

@jonatan-ivanov - the PR I provided passes all tests and DCO checks

I just mentioned in the issue #102 that it might be good to use 1.5.x for Spring Boot 3 and 2.0.x for Spring Boot 4