Ah, my apologies, I've not had to deal with a client having memory issues with Java 8 yet, so I've not run into the term. If I understand it correctly, I'd say that's not a problem - it's supposed to dynamically re-allocate as it's required, so it should really be full all the time.
Just upgraded from 6.4.2 to 6.4.11 In both versions, it is same situation as Mattias Ohlsson described (even after fresh start of machine and Jira 6.4.11). The Metaspace bar is always 100% used. @Nic Brough: the above screenshot shows 7 graphical bars, the 3rd from top is named "Metaspace" ... But we never encountered negative impact yet.
This should be the expected behavior when no maximum limit is configured for MetaSpace explicitly.
We have created the KB article below to clarify this behavior:
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