// Package metrics defines health-check-service's Prometheus metrics.
// Registered automatically (via promauto) into the default registry on
// import; served on /metrics.
//
// device_health_transitions_total is intentionally the same metric name
// device-control-service exposes for its "online" transitions (detected via
// MQTT touch) — this service only ever emits direction="offline". Prometheus
// aggregates same-named metrics across scrape targets/jobs transparently, so
// Grafana's `sum by (direction) (...)` panel keeps working across the split
// without a query change.
package metrics

import (
	"github.com/prometheus/client_golang/prometheus"
	"github.com/prometheus/client_golang/prometheus/promauto"
)

var HealthTransitionsTotal = promauto.NewCounterVec(prometheus.CounterOpts{
	Name: "device_health_transitions_total",
	Help: "Total number of device online/offline transitions detected.",
}, []string{"direction"})