Building upon work in https://gitlab.com/artkrz/telegraf-qnap
Example configuration improved so that it can be sanely used with Grafana (eg. using device identifiers and names and tags, preferring integeres for values instead of strings etc).
docker run -d --name qnap-snmp-telegraf \
-v /your_host_location/telegraf/telegraf.conf:/etc/telegraf/telegraf.conf \
qnap-snmp-telegraf --config /etc/telegraf/telegraf.conf
Based on snmpwalk it seems that Qnap doesn't publish eg. memory metrics (cache, buffers) so this config just uses the very basic free/total values from their own OIDs.
Didn't add SSD cache metrics as I don't use that feature