git:20260216.de47cb4 to git:20260313.02a8e7c

10 added, 11 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 |

+ | 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.

+ 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.