[#11050] Replace StopFlag with CompletableFuture.cancel

[emeroad]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 71.79487% with 11 lines in your changes missing coverage. Please review.

Project coverage is 37.03%. Comparing base (eac901b) to head (9e066c0).

❗ Current head 9e066c0 differs from pull request most recent head f3f1b76

Please upload reports for the commit f3f1b76 to get more accurate results.

Files	Patch %	Lines
...map/appender/server/DefaultServerInfoAppender.java	71.79%	10 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #11125      +/-   ##
============================================
+ Coverage     37.02%   37.03%   +0.01%     
- Complexity    11980    11986       +6     
============================================
  Files          3948     3948              
  Lines         97270    97285      +15     
  Branches      10392    10393       +1     
============================================
+ Hits          36010    36030      +20     
+ Misses        58297    58293       -4     
+ Partials       2963     2962       -1     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.