Observability terms
You cannot fix what you cannot see
Running software in production without observability is flying blind. Metrics, logs, traces, dashboards, alerting, and the three pillars of observability give you the insight needed to understand what your system is actually doing under real conditions. This category covers the tools, patterns, and vocabulary of production-grade visibility.
Canary Deployment & Observability
Canary deployments route a small percentage of traffic to a new version — compare its golden signals against the stable version before full rollout to catch regressions automatically.
2mo ago
observability intermediate
Cardinality in Metrics
Cardinality is the number of unique label value combinations — high cardinality (user_id, URL, session_id as labels) creates millions of time series and crashes Prometheus.
2mo ago
observability intermediate
Cardinality in Observability PHP 7.0+
The number of unique combinations of label values in a metric — high cardinality (millions of unique label combinations) causes memory exhaustion in time-series databases and is the most common observability scaling problem.
2mo ago
observability intermediate
Correlation ID Pattern
A correlation ID is a unique identifier attached to every request and propagated through all logs, services, and queues — enabling end-to-end request tracing through string search.
2mo ago
observability beginner