You've resolved one bottleneck in your system architecture. How do you prevent another from arising?

Congratulations on solving a bottleneck in your system! ?? Now that you've overcome this problem, it's important to take proactive steps to prevent others from arising. Provide the ability to scale the system both vertically (adding resources to a single server) and horizontally (adding multiple servers). For example, if the bottleneck is in your database, consider implementing sharding or replication. Make sure the workload is distributed evenly across system resources. The main idea is not to wait for the system to become overloaded, but to intervene proactively and continuously optimize the system architecture.

We should share our experiences with a wider audience. Proper documentation of root cause analysis. Open for discussion. Make sure the architecture team should have people for all domains. (At lest most of )

In general you can't know in advance where the bottlenecks are if you haven't profiled your application or system. If you understand the system well enough to know that, then you will know what to do to resolve these bottlenecks.

Organize the codebase by for example keywords indicating fragments of code, algorithms or crucial points of the system and maintain increasing, associative database of general problems connected with keywords. The you can just search for SIMILAR fragments like bottleneck or for possible unsafe areas. Invest with search engine and introduce appropriate metrics of bottlenecks. You can also connect to mentioned database well-known codebases from Internet.

One can detect the bottlenecks by testing, observing and isolating. The causes, bad practices and better methods can then be shared, which should help in prevention.