CPU information at cluster monitoring page is not accurate for Windows nodes

Issue Summary

When accessing the Clustering page on Jira nodes installed on Windows, the node information is not accurate.

Steps to Reproduce

1. Install Jira on a Windows Server
2. Enable clustering on that node (not required to have more than one node)
3. Access the Clustering page

Expected Results

• Node CPU information is not accurate.

Actual Results

• The information is not accurate. It's a negative value which seems to depend upon the number CPU installed on that node.