The fastest query is the one you never send, but the second fastest has a good index. Naming things well saved us more time than any framework migration. Security is mostly about saying no to defaults that were convenient in 2010.
What worked
Our on-call rotation improved the day we deleted half of the alerts. We wrote the migration twice: once to learn, once to ship. We measured first, and the bottleneck was not where anyone expected.
Logs answer questions you knew to ask; traces answer the ones you did not. The best architecture diagram is the one the new hire can redraw from memory.
Details
Caches are easy to add and surprisingly hard to remove. A boring deploy pipeline is a feature, not a lack of ambition. Every retry needs a budget, otherwise it is just a slower outage. Logs answer questions you knew to ask; traces answer the ones you did not.
The rollback plan should exist before the rollout plan is approved. Small pull requests get real reviews, large ones get approvals.
Trade-offs
Latency percentiles tell a story that averages politely hide. Every retry needs a budget, otherwise it is just a slower outage. Tests are documentation that fails loudly when it goes stale.
The fastest query is the one you never send, but the second fastest has a good index. The best architecture diagram is the one the new hire can redraw from memory.
A boring deploy pipeline is a feature, not a lack of ambition. Latency percentiles tell a story that averages politely hide.
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