Search the practice set

term

DORA Metrics

Four measures of software delivery performance — deployment frequency, lead time for change, change failure rate, and time to restore service.

Software Architecture term

Canary Release

Routing a small fraction of traffic to a new version, watching its metrics, and expanding or rolling back based on what they show.

Software Architecture term

Cardinality

The number of distinct time series produced by a metric, which is the product of the distinct values of all its labels — and the main driver of monitoring cost.

Observability term

RED Method

A minimal per-service dashboard: Rate, Errors, Duration — the request-centric view of whether users are being served.

Observability term

Target Tracking Scaling

An autoscaling policy that adds or removes capacity to hold a chosen metric near a target value, like a thermostat, rather than reacting to threshold breaches.

Autoscaling

quiz

A service autoscales on CPU. During incidents it never scales out, even as latency triples. Why, and what would you scale on instead?

Why CPU never triggers The service is latency bound, not compute bound. Its threads are waiting — on a database, a downstream API, a lock, or a connection pool

Autoscaling

topic

DORA Metrics

Throughput and stability moving together rather than trading off.

Software Architecture & Engineering — no content yet topic

Business Metrics

Orders per minute alongside error rate, because healthy is not enough.

Observability — no content yet topic

EA Metrics

Measuring whether architecture work changed anything.

Enterprise Architecture — no content yet topic

Metrics

Counters, gauges and histograms, and percentiles rather than means.

Observability — no content yet