[Metrics] `IllegalMonitorStateException` in `Sentry.metrics().notifyAll();`

[kahest]

Description

Originally posted by @sysmat in #3205 (comment)

• when using Sentry.metrics().notifyAll(); I get error

IllegalMonitorStateException: current thread is not owner
    at java.lang.Object.notifyAll(Object.java)
    at sentry.SentryMain.main(SentryMain.java:33)

• java 21, sentry 7.5.0

[markushi]

@sysmat is there any reason why your calling notifyAll()?

This stems from the java.lang.Object class in Object.notifyAll, which naturally every Java class inherits from.
E.g. even "Example".notifyAll() would cause a crash unless you use the object for some custom thread synchronization logic.

[romtsn]

@sysmat we're gonna close the issue, let us know if there's still a problem for you.