Maxscale 6.2.1 & 6.2.3 used a lot of RAM and Maxscale process have been killed due to:
Out of memory: Kill process 51956 (maxscale) score 927 or sacrifice child
The VM has 16 GB RAM and can extra 4 GB swapping.
Here I have attached the memory usage graphs and maxscale config file.
Please check it and let me know if you need any other logs..