Monitoring and troubleshooting data loading can help you detect and resolve issues, as well as improve your data quality and performance. Some of the common methods and tools that can be used to monitor and troubleshoot data loading include logging, alerting, and testing. Logging is the process of recording and storing information about your data loading activities, such as start time, end time, status, errors, warnings, and metrics. Alerting is the process of sending notifications or messages when something goes wrong or needs attention in your data loading processes. Testing is the process of verifying and validating your data loading processes. All three of these methods can help you track and audit your data loading processes, identify and debug problems, respond and recover from issues quickly, prevent further damage or loss, ensure that your data loading processes are working as expected, and catch and fix errors before they affect your data quality and performance. You can use built-in or external tools such as CloudWatch, Stackdriver, Splunk, Airflow alerts, SNS, PagerDuty, PyTest, unittest, or dbt to collect logs, configure alerts, create tests for your data loading processes.