How do you diagnose and identify the problems hindering the growth of your business?

For the last four years I have been working on an analytics platform for SaaS companies. It introduces diagnostics capabilities, such as

• Detection of existing problems by crunching historical data
• Real-time monitoring for momentary anomalies and outliers
• Continuous tracking of metrics trends for predictive diagnostics

At this point I really appreciate your real life experience on detecting and identifying the obstacles to growth.
Can you share tools, strategies and methods, anything you believe that will be useful for the rest of us.
Thanks!