Diun is a Go-based CLI daemon that monitors container image registries and notifies users when new versions or updates are available. It operates by polling container runtime environments (Docker, Swarm, Kubernetes, Nomad, containerd), or reading from YAML or Dockerfiles, to discover images, then compares their registry digests (or manifest list platform-specific digests) against a local bbolt database. When a change is detected, it sends notifications through one or more of 20+ channels (Slack, Discord, Telegram, email, webhook, MQTT, etc.). The system also exposes Prometheus metrics, a gRPC interface for image lifecycle management, and supports health checks via healthchecks.io. The architecture is modular: a scheduler component (cron-based with jitter and worker pool) triggers jobs that walk through configured providers (each implementing a `Handler` interface returning a list of `model.Image`), then for each image the registry client fetches the latest manifest (with tag sorting and filtering), compares it against the stored digest, updates the database, and dispatches notification entries through a notifier chain. The design cleanly separates provider discovery, registry inspection, state persistence, and notification delivery into independent packages. External dependencies include container runtime SDKs (Docker, containerd, Kubernetes, Nomad), the OCI distribution registry API, and each notification service's client library. The codebase is well-structured with strong test coverage, configuration via YAML and environment variables, and comprehensive CI/CD including e2e tests, static analysis, and vulnerability scanning. It is actively maintained with frequent releases and responsive issue triage. Primary entry points are `cmd/serve.go` (main daemon), `cmd/healthcheck.go`, `cmd/image.go` (gRPC-based image management), and `cmd/notif.go` (test notifications).
Universal Notifier is a Home Assistant custom integration that acts as a centralized notification router. It exposes a single `universal_notifier.send` service that fans out messages to multiple channels—text (Telegram, mobile app) and voice (Alexa, Google Home via TTS)—with context-aware features: time-of-day greetings, per-slot volume control, weekday/weekend Do Not Disturb schedules, priority bypass, and a FIFO async queue for serialized voice announcements. The integration also provides monitoring entities (volume sensor, family presence sensor, DND binary sensor) and runtime controls (priority volume select, text format select, voice buffer number, DND override switch, last-message text). Configuration is fully UI-driven via a multi-step config flow and an options menu for post-setup edits. Architecturally, the component is a typical Home Assistant custom component with modular entity platforms (sensor, binary_sensor, select, number, switch, text) and a core `__init__.py` that registers the service, manages the voice queue worker, and handles snapshot/resume of media players. The code is well-organized, uses standard HA patterns (config entries, entity registry, service registrations), and includes a solid test suite with high coverage. The main service handler is long and somewhat monolithic, but it is subdivided into labeled sections and handles many edge cases (e.g., `notify.send_message` target kwargs, Telegram chat IDs, MarkdownV2 escaping, SSML preservation for TTS). The utils module contains genuinely reusable text-processing and time-slot helper functions. Dependencies are minimal (only HA core), and the project uses `uv` for Python management and CI with GitHub Actions (tests, HACS validation, hassfest). It targets Python 3.13+ and requires HA 2025.12.1 or newer, indicating an up-to-date stack. External integrations like Telegram, Alexa Media Player, or TTS must be installed separately; this component merely routes to them. The repository is actively maintained with frequent releases and a changelog, and it supports multiple languages (READMEs and translations).