# backend Plugin

Backend platform discipline: observability, metrics instrumentation, and distributed tracing.

## Skills

| Skill           | Purpose                                                                                             |
| --------------- | --------------------------------------------------------------------------------------------------- |
| `observability` | Three pillars (logging, metrics, tracing) — interconnection, purposes, and high-level practices     |
| `prometheus`    | Prometheus metric types, naming, labels, cardinality, PromQL, alerting, instrumentation             |
| `statsd`        | StatsD metric types, naming, UDP push model, DogStatsD extensions, aggregation patterns             |
| `otel-tracing`  | OpenTelemetry tracing — spans, context propagation, instrumentation, sampling, semantic conventions |

## Plugin Scope

This plugin covers backend platform concerns — what's specific to building observable services, operators, workers, and
daemons. The `observability` skill provides high-level guidance across all three pillars; technology-specific skills
(`prometheus`, `statsd`, `otel-tracing`) cover tooling conventions. Language-specific skills (Go, TypeScript) are
provided by their respective language plugins.