See gh-23098

This reverts commit ab8e599c.

See gh-24805

Update `Log4J2LoggingSystem` so that call to `setLevel` with a `null`
level with remove the logger if it was previously configured by a
`LoggingSystem` call.

To track which loggers have been configured by us, and which have been
configure directly by the user, a custom `LoggerConfig` subclass is
used. We'll only remove `LevelSetLoggerConfig` classes, for any others
we'll call `setLevel(null)` on the config.

Prior to this commit, it was impossible to set then reset a logger
level using the actuator endpoint. This is because Log4J doesn't provide
a way to get the actual configured level. If the `setLevel(null)` has
been applied, then `getLevel()` will return the value of the parent
logger or a default value of `ERROR`.

Fixes gh-24298

Closes gh-26139

Add a `StandardConfigDataResource.getProfile()` method so that it's
possible to tell the profile used when reading a profile specific
resource.

Fixes gh-25940

Closes gh-26137

* pr/26135:
  Polish

Closes gh-26135

See gh-26135

* pr/26134:
  Add RepositoryMetricsAutoConfiguration to spring.factories

Closes gh-26134

See gh-26134

This reverts commit 51d57e19.

See gh-25838

See gh-26130

* pr/26129:
  Avoid some redirects in docs

Closes gh-26129

See gh-26129

See gh-26130

Closes gh-26130

Closes gh-25907

Closes gh-25907

Closes gh-25933

Closes gh-25932

Closes gh-25930

Closes gh-25929

Closes gh-26125

Closes gh-26124

* pr/25455:
  Polish 'Don't detect CloudPlatform when property is set'
  Don't detect CloudPlatform when property is set

Closes gh-25455

See gh-25455

Update `CloudPlatform.isActive` to back-off from detection when any
`spring.main.cloud-platform` property is set.

See gh-25455

Closes gh-26122

Closes gh-26121

Update `MavenPublishingConventions` to add a new `mavenOptional` feature
that allows us to declare optional dependencies that are also published
in the generated POM.

This change allows us to include the maven-shade-plugin in the
spring-boot-maven-plugin POM which fixes an issue with Eclipse m2e.

Fixes gh-21992

Fixes gh-23098