feat: enhance EvoBGP with new command-line options for the evobgp-agent, including a watch command for periodic configuration updates. Update go.mod with additional dependencies and improve Docker Compose setup for new services, including NATS and various worker components.

internal/observability/metrics.go

@@ -19,7 +19,7 @@ import (
 const namespace = "evobgp"
 
 var (
-	metricsMem            atomic.Pointer[store.Memory]
+	metricsStore          atomic.Value // store.Backend
 	registerCollectorOnce sync.Once
 )
 
@@ -122,15 +122,19 @@ func (c *memoryStoreCollector) Describe(ch chan<- *prometheus.Desc) {
 }
 
 func (c *memoryStoreCollector) Collect(ch chan<- prometheus.Metric) {
-	mem := metricsMem.Load()
-	if mem == nil {
+	v := metricsStore.Load()
+	if v == nil {
 		return
 	}
-	maxN, sumN := mem.MaterializedPrefixStats()
+	b, ok := v.(store.Backend)
+	if !ok || b == nil {
+		return
+	}
+	maxN, sumN := b.MaterializedPrefixStats()
 	ch <- prometheus.MustNewConstMetric(c.prefixMaxDesc, prometheus.GaugeValue, float64(maxN))
 	ch <- prometheus.MustNewConstMetric(c.prefixSumDesc, prometheus.GaugeValue, float64(sumN))
-	ch <- prometheus.MustNewConstMetric(c.peersDesc, prometheus.GaugeValue, float64(mem.PeerCount()))
-	for state, n := range mem.PeerSessionCountsByState() {
+	ch <- prometheus.MustNewConstMetric(c.peersDesc, prometheus.GaugeValue, float64(b.PeerCount()))
+	for state, n := range b.PeerSessionCountsByState() {
 		if state == "" {
 			state = "unknown"
 		}
@@ -138,15 +142,23 @@ func (c *memoryStoreCollector) Collect(ch chan<- prometheus.Metric) {
 	}
 }
 
-// RegisterStoreMetrics points Prometheus collectors at the given store (last call wins; safe for tests).
+// RegisterStoreBackend points Prometheus collectors at any store.Backend (last call wins; safe for tests).
+func RegisterStoreBackend(b store.Backend) {
+	if b == nil {
+		return
+	}
+	metricsStore.Store(b)
+	registerCollectorOnce.Do(func() {
+		prometheus.DefaultRegisterer.MustRegister(newMemoryStoreCollector())
+	})
+}
+
+// RegisterStoreMetrics is a deprecated alias for RegisterStoreBackend (memory-only callers).
 func RegisterStoreMetrics(mem *store.Memory) {
 	if mem == nil {
 		return
 	}
-	metricsMem.Store(mem)
-	registerCollectorOnce.Do(func() {
-		prometheus.DefaultRegisterer.MustRegister(newMemoryStoreCollector())
-	})
+	RegisterStoreBackend(mem)
 }
 
 // SetBirdSessionMetrics updates gauges from an optional birdc scrape.