1841 support for shutdown actuator

[ulischulte]

closes #1841

[codecov-commenter]

Codecov Report

Merging #1847 (7b84939) into master (bd1b21e) will increase coverage by 6.66%.
The diff coverage is n/a.

❗ Current head 7b84939 differs from pull request most recent head b2e3992. Consider uploading reports for the commit b2e3992 to get more accurate results

@@             Coverage Diff              @@
##             master    #1847      +/-   ##
============================================
+ Coverage     83.65%   90.32%   +6.66%     
+ Complexity     1243      147    -1096     
============================================
  Files           156       17     -139     
  Lines          3628      341    -3287     
  Branches        256       34     -222     
============================================
- Hits           3035      308    -2727     
+ Misses          463       18     -445     
+ Partials        130       15     -115     

Impacted Files	Coverage Δ
...tric/boot/admin/server/services/StatusUpdater.java
...min/server/web/client/LegacyEndpointConverter.java
...ric/boot/admin/server/notify/DingTalkNotifier.java
...in/server/notify/HazelcastNotificationTrigger.java
...centric/boot/admin/server/ui/web/UiController.java
...ic/boot/admin/server/domain/values/InstanceId.java
...tric/boot/admin/server/notify/LoggingNotifier.java
...ic/boot/admin/server/notify/PagerdutyNotifier.java
...oot/admin/server/services/ApplicationRegistry.java
...java/de/codecentric/boot/admin/CustomNotifier.java
... and 129 more

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