feat(otelunifi): add OpenTelemetry output plugin
Adds a new push-based output plugin that exports UniFi metrics to any
OTLP-compatible backend (Grafana Alloy/Mimir, Honeycomb, Datadog via
OTel, New Relic, etc.) using the Go OpenTelemetry SDK v1.42.
Config (default disabled):
[otel]
url = "http://localhost:4318"
protocol = "http" # or "grpc"
interval = "30s"
timeout = "10s"
disable = false
api_key = "" # optional Bearer auth
Env var prefix: UP_OTEL_*
Exported metrics:
- Sites: user/guest/IoT counts, AP/GW/SW counts, latency, uptime,
tx/rx rates per subsystem
- Clients: uptime, rx/tx bytes & rates; signal/noise/RSSI for wireless
- UAP: up, uptime, CPU/mem, load, per-radio channel/power,
per-VAP station count/satisfaction/bytes
- USW: up, uptime, CPU/mem, load, aggregate rx/tx bytes,
per-port up/speed/bytes/packets/errors/dropped/PoE
- USG: up, uptime, CPU/mem, load, per-WAN rx/tx bytes/packets/errors
- UDM/UXG: up, uptime, CPU/mem, load averages
Closes #933
Co-Authored-By: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>
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