Report a ReentrantShortLock that holds a lock for a long time.

[ikhoon]

ReentrantShortLock is designed to allow a locking operation in non-blocking threads. ReentrantShortLock is used cautiously when an operation is finished quickly. It is excluded from the BlockHound rule to avoid false positive reports.

armeria/core/src/main/java/com/linecorp/armeria/common/CoreBlockHoundIntegration.java

Lines 36 to 37 in d853651

	builder.allowBlockingCallsInside("com.linecorp.armeria.internal.common.util.ReentrantShortLock",
	"lock");

This causes another issue where a long lock acquisition in ReentrantShortLock is not detected.
To solve this problem, it would be nice if there was a way to notify through a warning or metric if ReentrantShortLock is occupying the lock for more than a certain amount of time. (Suggested by @jrhee17)