If your site uses the SmartFlow integration, ezyVet records technical information about the data sync of the two systems. ezyVet puts the information in the Smart Flow Sheet Events section of the Smart Flow dashboard tab:

Each entry shows an item of data that ezyVet received from SmartFlow. The Status column and Notes column of each entry shows information that can help you to do troubleshooting. And if you hover over an entry, ezyVet shows very technical information that you can send to IDEXX customer support if necessary: