Added big info about Sleuth not working with Boot 3; fixes gh-2245

Author: marcingrzejszczak

README.adoc

@@ -12,6 +12,18 @@ image::https://badges.gitter.im/spring-cloud/spring-cloud-sleuth.svg[Gitter,link
 
 == Spring Cloud Sleuth
 
+=== !!!! IMPORTANT !!!!
+
+Spring Cloud Sleuth's last minor version is 3.1. You can check the https://github.com/spring-cloud/spring-cloud-sleuth/tree/3.1.x[3.1.x] branch for the latest commits.
+
+WARNING: Spring Cloud Sleuth will not work with Spring Boot 3.x onward. The last major version of Spring Boot that Sleuth will support is 2.x.
+
+The core of this project got moved to https://micrometer.io/docs/tracing[Micrometer Tracing] project and the instrumentations will be moved to https://micrometer.io/[Micrometer] and all respective projects (no longer all instrumentations will be done in a single repository.
+
+You can check the https://github.com/micrometer-metrics/tracing/wiki/Spring-Cloud-Sleuth-3.1-Migration-Guide[Micrometer Tracing migration guide] to learn how to migrate from Spring Cloud Sleuth to Micrometer Tracing.
+
+=== Introduction
+
 Spring Cloud Sleuth provides Spring Boot auto-configuration for distributed tracing.
 
 Sleuth configures everything you need to get started.

docs/src/main/asciidoc/README.adoc

@@ -5,6 +5,18 @@ image::https://badges.gitter.im/spring-cloud/spring-cloud-sleuth.svg[Gitter,link
 
 == Spring Cloud Sleuth
 
+=== !!!! IMPORTANT !!!!
+
+Spring Cloud Sleuth's last minor version is 3.1. You can check the https://github.com/spring-cloud/spring-cloud-sleuth/tree/3.1.x[3.1.x] branch for the latest commits.
+
+WARNING: Spring Cloud Sleuth will not work with Spring Boot 3.x onward. The last major version of Spring Boot that Sleuth will support is 2.x.
+
+The core of this project got moved to https://micrometer.io/docs/tracing[Micrometer Tracing] project and the instrumentations will be moved to https://micrometer.io/[Micrometer] and all respective projects (no longer all instrumentations will be done in a single repository.
+
+You can check the https://github.com/micrometer-metrics/tracing/wiki/Spring-Cloud-Sleuth-3.1-Migration-Guide[Micrometer Tracing migration guide] to learn how to migrate from Spring Cloud Sleuth to Micrometer Tracing.
+
+=== Introduction
+
 Spring Cloud Sleuth provides Spring Boot auto-configuration for distributed tracing.
 
 Sleuth configures everything you need to get started.

docs/src/main/asciidoc/spring-cloud-sleuth.adoc

@@ -2,6 +2,16 @@
 = Spring Cloud Sleuth Reference Documentation
 Adrian Cole, Spencer Gibb, Marcin Grzejszczak, Dave Syer, Jay Bryant
 
+== !!!! IMPORTANT !!!!
+
+Spring Cloud Sleuth's last minor version is 3.1. You can check the https://github.com/spring-cloud/spring-cloud-sleuth/tree/3.1.x[3.1.x] branch for the latest commits.
+
+WARNING: Spring Cloud Sleuth will not work with Spring Boot 3.x onward. The last major version of Spring Boot that Sleuth will support is 2.x.
+
+The core of this project got moved to https://micrometer.io/docs/tracing[Micrometer Tracing] project and the instrumentations will be moved to https://micrometer.io/[Micrometer] and all respective projects (no longer all instrumentations will be done in a single repository.
+
+You can check the https://github.com/micrometer-metrics/tracing/wiki/Spring-Cloud-Sleuth-3.1-Migration-Guide[Micrometer Tracing migration guide] to learn how to migrate from Spring Cloud Sleuth to Micrometer Tracing.
+
 :docinfo: shared
 include::_attributes.adoc[]
 

docs/src/main/asciidoc/spring-cloud-sleuth.htmlsingleadoc

@@ -2,6 +2,16 @@
 = Spring Cloud Sleuth Reference Documentation
 Adrian Cole, Spencer Gibb, Marcin Grzejszczak, Dave Syer, Jay Bryant
 
+== !!!! IMPORTANT !!!!
+
+Spring Cloud Sleuth's last minor version is 3.1. You can check the https://github.com/spring-cloud/spring-cloud-sleuth/tree/3.1.x[3.1.x] branch for the latest commits.
+
+WARNING: Spring Cloud Sleuth will not work with Spring Boot 3.x onward. The last major version of Spring Boot that Sleuth will support is 2.x.
+
+The core of this project got moved to https://micrometer.io/docs/tracing[Micrometer Tracing] project and the instrumentations will be moved to https://micrometer.io/[Micrometer] and all respective projects (no longer all instrumentations will be done in a single repository.
+
+You can check the https://github.com/micrometer-metrics/tracing/wiki/Spring-Cloud-Sleuth-3.1-Migration-Guide[Micrometer Tracing migration guide] to learn how to migrate from Spring Cloud Sleuth to Micrometer Tracing.
+
 :docinfo: shared
 include::_attributes.adoc[]
 
@@ -11,4 +21,4 @@ include::using.adoc[leveloffset=+1]
 include::project-features.adoc[leveloffset=+1]
 include::howto.adoc[leveloffset=+1]
 include::integrations.adoc[leveloffset=+1]
-include::appendix.adoc[leveloffset=+1]
+include::appendix.adoc[leveloffset=+1]

docs/src/main/asciidoc/spring-cloud-sleuth.pdfadoc

@@ -2,6 +2,16 @@
 = Spring Cloud Sleuth Reference Documentation
 Adrian Cole, Spencer Gibb, Marcin Grzejszczak, Dave Syer, Jay Bryant
 
+== !!!! IMPORTANT !!!!
+
+Spring Cloud Sleuth's last minor version is 3.1. You can check the https://github.com/spring-cloud/spring-cloud-sleuth/tree/3.1.x[3.1.x] branch for the latest commits.
+
+WARNING: Spring Cloud Sleuth will not work with Spring Boot 3.x onward. The last major version of Spring Boot that Sleuth will support is 2.x.
+
+The core of this project got moved to https://micrometer.io/docs/tracing[Micrometer Tracing] project and the instrumentations will be moved to https://micrometer.io/[Micrometer] and all respective projects (no longer all instrumentations will be done in a single repository.
+
+You can check the https://github.com/micrometer-metrics/tracing/wiki/Spring-Cloud-Sleuth-3.1-Migration-Guide[Micrometer Tracing migration guide] to learn how to migrate from Spring Cloud Sleuth to Micrometer Tracing.
+
 include::_attributes.adoc[]
 
 include::legal.adoc[leveloffset=+1]