• Spring Boot 2.3.0 M4 Release Notes
• Upgrading from Spring Boot 2.2
• Building layered jars
• Default layers
• Customizing layers with Maven
• Couchbase 3
• Embedded Servlet web server threading configuration
• Disk space health indicator
• Supported versions of Gradle
• Upgrading from Spring Boot 2.3.0.M3
• New and noteworthy
• Liveness and Readiness probes
• Building OCI images
• Building layered jars
• Custom layers with Gradle
• Configurable base path for WebFlux applications
• Contributing additional tags to Web MVC and WebFlux metrics
• Dependency Upgrades
• Miscellaneous
• Deprecations in Spring Boot 2.3.0 M4