Glossary

The words, without the shrug

Every term the courses use, defined in one line and then in a paragraph. Written to be read out of order.

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Metrics

Infrastructure

Numbers tracked over time.

Counts and durations: requests per minute, error rate, response time. Cheap to keep for a long time and the right tool for "is this worse than yesterday". Cannot tell you about one specific user.

Migration

Data & Databases

A recorded, ordered change to your data’s shape.

A versioned schema change applied identically in every environment. Needed because code can be rolled back in seconds and data cannot. Safe changes expand first, then contract days later.