Heart beat report
Not just for human.
These are critical for ensuring the system up and running. Provide a cron job to monitor the system.
Before running the ETL process, check if the source data is correct. Asking the users to fix or prepare the data before running ETL.
Checking if required setup is there, if the system is configured, before letting people use the system.
Before upgrading or applying patches, check if the system is healthy.
After upgrade or patching, check if the system is still healthy.