PowerPivot: Usage data is not getting updated at the expected frequency

I was getting the below warning from Central Administration SharePoint Health Analyzer

Title:  PowerPivot: Usage data is not getting updated at the expected frequency. 

Severity:  2 - Warning 

Category:  Configuration 

Explanation:

The PowerPivot Management Data.xlsx file is not being updated. This workbook stores internal data used by the PowerPivot Management Dashboard. The current file for PowerPivot service application <0> was last updated 5 day(s) ago.

Resolution

1) Check under what account the PowerPivotUnattendedAccount is running.

2) Open SQL Management Studio and browse to Security -> Logins

3) Give db_datareader permission to PowerPivotUnattendedAccount for the PowerPivot Service Application database