Closes gh-17814

Closes gh-17933

Update the reference guide with a note about using environment variables
to configure logging.

Closes gh-17958

This reverts commit f6f99d78 as 9.4.20
includes an incompatible class change where an abstract class in
Jetty's public API was changed to an interface, making it incompatible
with Framework 5.1.9.

See gh-18035

Closes gh-18043

Closes gh-18042

Closes gh-18041

Closes gh-18040

Closes gh-18039

Closes gh-18038

Closes gh-18037

Closes gh-18036

Closes gh-18035

Closes gh-18034

Closes gh-18033

Closes gh-18032

Closes gh-18031

Closes gh-18030

Closes gh-18029

Closes gh-18028

Fixes gh-18018

Closes gh-17975

Closes gh-17988

Update the reference documentation to use versioned links rather then
`/current/` whenever possible.

Closes gh-18000

Update reference documentation source to use consistent attribute names
and fix a few formatting issues.

Fixup ignore logic in `EndpointRequest`.

See gh-18012

Closes gh-18002

Update the reference documentation so that "Web Application Conditions"
also covers reactive contexts.

Closes gh-18005

Fix caching issues in `ApplicationContextRequestMatcher` and allow
subclasses to ignore an application context entirely. Update existing
matcher implementations so that they deal with the management context
correctly.

Prior to this commit, the `ApplicationContextRequestMatcher` would
return a context cached from the first request. It also didn't
provide any way to ignore a context. This meant that if the user was
running the management server on a different port the matching results
could be inconsistent depending on if the first request arrived on
the regular context or the management context. It also meant that we
could not distinguish between the regular context and the management
context when matching.

Closes gh-18012

* gh-18015:
  Remove reference to non-existent --edit option in CLI docs

Closes gh-18015

See gh-18015

Update reference documentation to use one sentence per line formatting
as recommended by the Asciidoctor team.

Closes gh-12445

* gh-17976:
  Use exec when launching the JVM in CLI's shell script

Closes gh-17976

Previously, when the Spring Boot CLI ran the Java command line for an
application it did a straight invocation which suppressed propagation of
signals to the JVM in certain circumstances (e.g within Docker containers).

This change prepends the command with exec which causes the Java process to
replace the script process in a shell ensuring that signals are propagated to
the Java process without suppression.

See gh-17976
Signed-off-by: Ben Hale <bhale@pivotal.io>

* gh-17984:
  Test the Gradle Plugin against Gradle 5.6.1

Closes gh-17984

See gh-17984

Closes gh-17984

Previously, MetaInfResourceManager that we use with Undertow to serve
static resources from jar's META-INF/resources did not correctly
handle characters in the path that should be percent-encoded when
used in a URL.

This commit updates MetaInfResourceManager to encode the path before
it is used to create a URL. Prior to this encoding, encoded slashes
(%2F) are decoded as, unlike other encoded characters in the request's
URL, encoded slashes are not decoded prior to calling the
ResourceManager.

Fixes gh-17853

This commit also changes the request matcher for MVC
endpoints to use an AntPathRequestMatcher instead of an
MvcRequestMatcher. The endpoint is always available
under the mapped endpoint path and this way the same matcher
can be used for both MVC and Jersey.

Fixes gh-17912
Co-authored-by: Phillip Webb <pwebb@pivotal.io>