How to: ![✔] 2.9 Discover errors and downtime using APM products
**TL;DR:** Monitoring and performance products (a.k.a APM) proactively gauge your codebase or API so they can automagically highlight errors, crashes, and slow parts that you were missing

**Otherwise:** You might spend great effort on measuring API performance and downtimes, probably you’ll never be aware which are your slowest code parts under real-world scenario and how these affect the UX

🔗 [**Read More: using APM products**](./sections/errorhandling/apmproducts.md)