The operating system killed the server for using too much memory
What causes it
The process was killed from outside Java (exit 137, the OOM killer). Heap plus off-heap memory grew past the machine or container limit; the log just stops with no Java error.
How to fix it
Set -Xmx to roughly 75-85% of the available memory so the JVM has headroom for everything outside the heap, or move to a machine with more memory.
Not sure this is your problem? Paste your log and Roastd will tell you which of these it actually matched, and what else it found.
Check your own log