Cody Lee 6c5ff5482d feat(promunifi): add unifi_controller_up gauge metric (closes #356) (#974) ...

Add a per-controller `<namespace>_controller_up` Prometheus GaugeVec with
a `source` label (controller URL or configured ID). The gauge is set to 1
after each successful poll and 0 on failure, giving operators a standard
metric to alert on controller connectivity issues.

Changes:
- pkg/poller/config.go: add ControllerStatus type and ControllerStatuses
  field to Metrics so any output plugin can consume per-controller health.
- pkg/poller/inputs.go: merge ControllerStatuses when AppendMetrics is
  called (multiple input sources).
- pkg/inputunifi/interface.go: populate ControllerStatuses with Up=true
  on success and Up=false (while still continuing) on per-controller error.
- pkg/promunifi/collector.go: declare and register a prometheus.GaugeVec
  `<namespace>_controller_up`; set the gauge for each controller status
  after every Collect cycle.

Co-authored-by: Claude Sonnet 4.6 (1M context) <noreply@anthropic.com>

2026-03-23 15:25:00 -05:00

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