I have not fully understood your question.
Are you looking for ready made Queries.
For windows or Linux?
There are plugins available which can get you up and ready in no time with little changes as per your environment.
Also you can try below link there are several use cases and example dashboards.
If you look in _internal database for the db information (disk use, db size, heap usage). Install telegraf on your DB servers and just use the default inputs.cpu, inputs.mem to collect CPU and Memory information