Closes gh-6432

Closes gh-6419

4.1.2 is not going to be out in time for inclusion in 1.4.0

See gh-6390

Update logback `base.xml` so that both `LOG_PATH` and `LOG_TEMP` can
be specified without a trailing slash.

Fixes gh-6423

See gh-5849

Update the `/env` sample used in the actuator docs to use only a limited
set of keys.

Fixes gh-5849

This reverts commit 037e6974.

See gh-6406

Closes gh-5461

Closes gh-5046

Closes gh-6418

Closes gh-6412

Closes gh-6417

Fix Gradle test broken when `tomcat-juli` was removed.

See gh-6192

Upgrade the managed Tomcat dependency to 8.5.4 and remove `tomcat-juli`
since it's now included in `tomcat-embed-core`.

Fixes gh-6192

* tomcat-engine-valves:
  Register valves at the engine level
  Add support for engine valves

Update `ServerProperties` to register `AccessLogValve` and
`RemoteIpValve` at the engine level.

Closes gh-6311

Update TomcatEmbeddedServletContainerFactory to allow registration of
engine valves as well as context values. For clarity the ambiguous
`getValues()` method has been deprecated in favor of
`getContextValves()`

See gh-6311

It doesn't appear to be on Maven Central

This reverts commit 6741e6a2.

* ServletContextInitializer-patch-1:
  Fixed ServletContextInitializer documentation

Closes gh-6410

* Spring-AMQP-1.6.1:
  Upgrade to Spring AMQP 1.6.1.RELEASE

Closes gh-6414

Update Log4J2LoggingSystem so that the FILTER is applied to the main
configuration and not to the root logger. Prior to this commit calls
to `logger.isErrorEnabled()` would not consider the filter and hence
would always return `true`. This caused `SpringApplication` to silently
swallow exceptions.

Fixes gh-5271

Closes gh-6415

Update ServletComponentScanRegistrar to make use of Spring Framework's
updated alias support with ASM reading.

See gh-6337

Restore original get method functionality in DataSourceProperties in
a deprecated form.

Fixes gh-6406

Closes gh-6384

* pr/6059:
  Polish contribution
  Fix Bug HealthIndicator for Redis Cluster