Spring Boot Application not terminating with logback

[prajal55]

I have a logback.xml configured and enabling the splunk appender on ROOT logger makes the application not terminate. I have seen some closed issues regarding this; I am facing this issue in 1.11.7

[restartedMain] DEBUG o.a.h.i.c.PoolingHttpClientConnectionManager - Connection manager shut down

[restartedMain] INFO  com.app.Application - Execution time in seconds: 0

[restartedMain] DEBUG o.s.boot.devtools.restart.Restarter - Creating new Restarter for thread Thread[main,5,main]

[restartedMain] DEBUG o.s.boot.devtools.restart.Restarter - Immediately restarting application

[restartedMain] DEBUG o.s.boot.devtools.restart.Restarter - Starting application com.app.Application with URLs [file:/workspaces/app/target/classes/]

[restartedMain] DEBUG o.s.b.a.ApplicationAvailabilityBean - Application availability state ReadinessState changed to ACCEPTING_TRAFFIC

Any Ideas?