MeterRegistryPostProcessor not ran when MeterRegistry injected in cache configuration beans

[Nik95]

I wanted to add some metrics provided by Lettuce for monitoring purpose of connections to Redis.
But when injecting MeterRegistry in our Configuration class, MeterRegistryProcessor is no longer called, hence MeterRegistry is not configured.

Similar issue has been reported here #18565, but only a fix for Spring Cloud Sleuth use case has been done.

I've built a minimal sample application to reproduce issue: https://github.com/Nik95/sample-spring-boot

[snicoll]

Thanks for the sample.

Running it leads to the following:

2021-12-15 15:14:05.681  INFO 67962 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.actuate.autoconfigure.metrics.export.simple.SimpleMetricsExportAutoConfiguration' of type [org.springframework.boot.actuate.autoconfigure.metrics.export.simple.SimpleMetricsExportAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-12-15 15:14:05.698  INFO 67962 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'management.metrics.export.simple-org.springframework.boot.actuate.autoconfigure.metrics.export.simple.SimpleProperties' of type [org.springframework.boot.actuate.autoconfigure.metrics.export.simple.SimpleProperties] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-12-15 15:14:05.701  INFO 67962 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'simpleConfig' of type [org.springframework.boot.actuate.autoconfigure.metrics.export.simple.SimplePropertiesConfigAdapter] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-12-15 15:14:05.704  INFO 67962 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration' of type [org.springframework.boot.actuate.autoconfigure.metrics.MetricsAutoConfiguration] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-12-15 15:14:05.705  INFO 67962 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'micrometerClock' of type [io.micrometer.core.instrument.Clock$1] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-12-15 15:14:05.726  INFO 67962 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'simpleMeterRegistry' of type [io.micrometer.core.instrument.simple.SimpleMeterRegistry] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)
2021-12-15 15:14:05.728  INFO 67962 --- [           main] trationDelegate$BeanPostProcessorChecker : Bean 'cacheConfiguration' of type [org.example.CacheConfiguration$$EnhancerBySpringCGLIB$$5d2571d3] is not eligible for getting processed by all BeanPostProcessors (for example: not eligible for auto-proxying)

This is due to early initialization of CachingConfigurer that was fixed today and will be available with the next release. I've updated your sample app to 2.6.2-SNAPSHOT and this went away.

A couple of remarks about the sample: there's no need to provide a version for Spring Data Redis or Lettuce, and using field autowiring on the MeterRegistry isn't great regardless as it forces the container to resolve that very early. A much better approach for this would be a customization using ClientResourcesBuilderCustomizer. That's actually what Spring Boot does out of the box.

[Nik95]

Thanks @snicoll for the fix.

Regarding your remarks, it is just because I copy/paste code from our actual prod application that use an older Spring / Spring boot version.