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dabfeffe66
Decouples Prometheus scrape cadence from upstream UniFi API calls so a 429 backoff loop on the controller side no longer stalls /metrics. The output plugin now owns a 60s background poller (configurable) whose result is served from an in-memory cache. Concurrent /scrape requests for the same target are coalesced via singleflight to prevent a noisy scraper from multiplying upstream load. Adds two new metrics so operators can detect cache staleness and refresh failures independently: - unpoller_prometheus_cache_age_seconds - unpoller_prometheus_refresh_failures_total Background goroutine recovers from panics so a malformed input payload no longer silently kills refreshes. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>