I suggest Mikrotik add SNMP OIDs to track the amount of ipv4 and ipv6 statefull firewall sessions as well of the amount of hardware offloaded ones.It may in fact be interesting to have anything that is limited by memory in hardware offloading to know where we are in term of ressources used…
What you mean by system notes? If you use a translator and you have in mind log, and if your hardware uses the flash memory as the only disk storage (some devices use a ramdisk for most files), then yes, you can configure logging in such a way that script events are logged to “memory” (so always RAM) rather than to disk (RAM or FLASH depending on device model) or not logged at all.