It looks like the SslMetricsAutoConfiguration defined in the spring-boot-micrometer-metrics module is not listed among the auto-configurations that Spring Boot should import.

The org.springframework.boot.autoconfigure.AutoConfiguration.imports file is missing this line:

org.springframework.boot.micrometer.metrics.autoconfigure.ssl.SslMetricsAutoConfiguration

If this accepted as a bug, I'm available to submit a PR. Thanks.