Closes gh-25851

Closes gh-25844

Previously, would log an error for any exception and also stop
publishing for an UnknownHostException. By constrast, Micrometer's
PushMeterRegistry treats all exceptions the same, logging a warning
and continuing with subsequent push attempts.

This commit updates the push gateway manager's behaviour to match
PushMeterRegistry. UknownHostExceptions no longer receive special
treatment and push (and delete) failures are now logged as warnings
rather than errors.

Fixes gh-25804

Closes gh-25839

This commit modifies the integration tests for the Maven and Gradle
image building goal and task to use a custom builder as a test harness
to verify that the plugins invoke the builder as expected.

Fixes gh-25838

See gh-25836

See gh-25835

Closes gh-25836

Closes gh-25835

Closes gh-25832

* gh-25621:
  Polish "Document Failsafe configuration when not using starter parent"
  Document Failsafe configuration when not using starter parent

Closes gh-25621

See gh-25621

See gh-25621

Restore the patch version number for consistency with `@since`
tags.

See gh-25808

See gh-25825

See gh-25808

Closes gh-25825

Update all deprecation tags to include a removal target.

Closes gh-25808

Closes gh-25822

Closes gh-25821

See gh-25819

Closes gh-25819

Closes gh-25812

* pr/25810:
  Fix flaky QuartzAutoConfigurationTests

Closes gh-25810

See gh-25810

Closes gh-25789

Fixes gh-25736

Previously, the configuration metadata annotation processor only
declared support for `@Endpoint` and none of the other more
specialized `@…Endpoint` annotations that are meta-annotated with
`@Endpoint` such as `@WebEndpoint` and `@JmxEndpoint. This would
result in missing metadata if a full or incremental build only
compiled classes annotated with one of the more specialized
`@…Endpoint` annotations as the annotation processor would not be
called.

This commit updates the processor's supported annotation types to
include every known `@…Endpoint` annotation. The test processor has
also been similarly updated to align its behaviour with that of the
main processor.

Fixes gh-25388

Deprecate the `Bootstrapper` interface entirely and provide a
`BootstrapRegistryInitializer` alternative so that people can migrate.

Unfortunately our previous attempt to fix the typo in the `Bootstrapper`
interface didn't provide us a way to remove the deprecated method
without impacting users. It was also problematic for people who were
implementing `Bootstrapper` rather than using a lambda since they needed
to introduce the deprecated method.

We unfortunately can't see a way to fix the original typo without
introducing a new interface.

Fixes gh-25735

Closes gh-25786

* pr/25778:
  Polish 'Ignore quality value when removing MediaType.ALL'
  Ignore quality value when removing MediaType.ALL

Closes gh-25778

See gh-25778

Update the default reactive exception handler so that `MediaType.ALL`
is removed regardless of any quality setting. Prior to this commit,
the "match-all" media type was not properly ignored if it has a quality
value and would show HTML content if the accept header was
`application/json, */*;q=0.9`.

See gh-25778

Closes gh-25784

Update `AbstractWebMvcEndpointHandlerMapping` to chain any caught
InvalidEndpointRequestExceptions so that a more complete stacktrace
is available. The exception has also been updated to a
`ResponseStatusException` so that the reason can be propagated.

Fixes gh-25642