ZGC and Xmx and vm.max_map_count

Question

We have a java 17 application which run with theses options:

-Xmx100g
-XX:+UseZGC

When running it, these gc warnings appear:

[warning][gc] 
***** WARNING! INCORRECT SYSTEM CONFIGURATION DETECTED! *****
The system limit on number of memory mappings per process might be too low for the given
max Java heap size (102400M). Please adjust /proc/sys/vm/max_map_count to allow for at
least 184320 mappings (current limit is 65530). Continuing execution with the current
limit could lead to a premature OutOfMemoryError being thrown, due to failure to map memory.

And after a few hours, by increasing heap usage (about ~ 60gb), application encountered OOM and crashed.

Based on the above warning: 184320 = 1.8 * 102400; Also i'v tried other Xmx values, the formula is:

vm.max_map_count = 1.8 * xmx_in_mb

My questions:

1. What is the relation of ZGC and vm.max_map_count? I can't find any official documentation about it!
2. Is it safe to use the above formula?