git:20260313.02a8e7c to git:20260801.ec64dda

5 added, 6 removed. Audit A to A.

# 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 |

+ - **`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.