Hi, I'm coming with a hint.

spring boot version: 2.7.8 spring-boot-starter-actuator: 2.7.8

spring config:

server.port=**8080**
management.server.port= **8090**
server.tomcat.threads.min-spare=**1000**
server.tomcat.threads.max=2500
#this maybe not important
server.http2.enabled=true

result: application has 1000x "http-nio-8080-exec-X" and 1000x "http-nio-8090-exec-X"

desired: I think it would be nice to configure max actuator threads since actuator is used just for health check and monitor(commonly). Actuator doesn't need so many threads.

Comment From: wilkinsona

Thanks for the suggestion. This is a duplicate of #9560.