[TASK] add nproc to database

[genofire]

Description

Motivation and Context

fixed #127

Checklist:

• My code follows the code style of this project.
• I have added also tests for my new code.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.

[codecov-io]

Codecov Report

Merging #129 into master will increase coverage by 0.23%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master     #129      +/-   ##
==========================================
+ Coverage   75.78%   76.02%   +0.23%     
==========================================
  Files          43       43              
  Lines        1371     1372       +1     
==========================================
+ Hits         1039     1043       +4     
+ Misses        309      306       -3     
  Partials       23       23

Impacted Files	Coverage Δ
database/influxdb/node.go	95.23% <100%> (+0.05%)	⬆️
respond/collector.go	28.57% <0%> (+1.86%)	⬆️