Asked about Using traces to improve the system
How useful is thumbs-up and thumbs-down feedback?
An answer that works
Useful as a pointer to where to look, and noisy and biased as a measure, since only some users click. Behavioural signals such as retries and abandonment are often more informative.
Reading an answer is not being able to give one. The section that teaches this is Using traces to improve the system, 4 hours of Tracing & observability.
Learn this properly