ax3 write-sect-since-reboot over 9000 a day on 7.14, 7.15

before 7.14, it’s less than 1K writes each day
7.14, 7.15 it’s 7~9K writes each day

same config, not storing dhcp leases, all leases are static, dynamic access lists are hostnames with 5min ttl, acting as dns prefetch for slow dns resolves

When I update to 7.14, I also updated the firmware to 7.14, before that the 7.9~7.13 were with factory firmware 7.5
updating firmware from 7.5 to 7.14 also dropped total-memory from 960 to 928

Was it 7.14 or the firmware somewhere between 7.5 and 7.14?

Or was it something to do with snmp with mikrotik mib?
I changed prometheus’s snmp_exporter from using generic snmp to mikrotik specific one, for the additional cpu temperature and free ram/disk counters, the same week updating ros/firmware to 7.14, but I tried change it back to the generic snmp and it still writes crazily, so I left it using mikrotik mib. snmp_exporter is set to scrape every 1min.