MySQL Instances Overview: Many monitored instances (~250+) gives 'too long query' error

During the Performance testing with VM for 2.12.0, We came across issue with Reports showing the error for Query being too long. 

This is the error visible in MySQL Instances Overview Dashboard, see screenshot for details, the error message is available in the text file as an attachment to this report. 

This issue could be possible also on other Dashboards, so the fix should cover all scenarios and DB's. 

STR: 

1) Added around 251 DB services to be monitored across 26 Hosts instances.

2) MySQL Instances were added for PS 8.0 (both query source perfschema & slowlog)

3) Wait for some time and Navigate to MySQL Instances Overview Dashboard

4) See Errors in Reports.

Expected Result: This should work as expected without any errors in Queries.

This behaviour has been checked in PMM 2.11.1 and seems to be working fine without any such too long query errors on the same dashboard.