Frames the mental model for making a running system explain itself — metrics, logs, and traces as complementary signals, RED and USE checklists, SLOs and error budgets, cardinality as the tax paid for detail. Use this whenever the user asks why something broke with no warning, is deciding what to in
Frames the mental model for making a running system explain itself — metrics, logs, and traces as complementary signals, RED and USE checklists, SLOs and error budgets, cardinality as the tax paid for detail. Use this whenever the user asks why something broke with no warning, is deciding what to instrument before a service ships, is choosing between a metric, log, or trace, or asks what observabi