The title of the question pretty much says it all. (btw, its a Hotspot JVM)
I am troubleshooting memory issue, and suspect that the Old Gen is too fragmented to allocate large memory chunk and thus, throw a OOM. (Since there are many times in chart that I see the memory usage is higher and yet no OOM)
If there's no such metric, any workaround or any other way I can possible achive this or see how fragmented the heap gets?