Operations notebook

Make the next change a small one.

Reliable maintenance starts with knowing what works today. Keep a short baseline, introduce one change and compare the result with the original conditions.

Leave a way back

Preserve the previous configuration and make rollback a routine operation. A successful deployment includes checking that unrelated services continue to behave as expected.

Separate signal from noise

A failed request, a slow response and an unavailable service are different events. Record enough context to tell them apart while avoiding unnecessary collection of personal data.