git:20260216.ecb01b1 to git:20260216.de47cb4

9 added, 4 removed. Audit A to A.

# backend Plugin

- Backend platform discipline: observability, API design, and service architecture practices.

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

## Skills

| Skill | Purpose |

|-------|---------|

- | `logging` | Logging conventions, structured logging, and log level practices |

+ | `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 services, operators,

- workers, and daemons. Language-specific skills (Go, TypeScript) are provided by their respective

+ 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.