Log folder contents deleted getting cron mails and getting below error.
Cannot open /var/log/sa/sa03: No such file or directory
Login to server via SSH
Go inside /var/log/ folder
cd /var/log/
Check for sa folder, if it is not present then create it manually using below command. Files will be generated automatically inside that folder
mkdir sa
To check try running sar command after 1 to hours it will start working.