fix(circuitbreaker): guard nil monitoring to prevent boot panic

Starting with ENABLE_CIRCUIT_BREAKER=true panicked at boot: parseConfig -> initCircuitBreaker registers a metrics gauge, but cfg.Monitoring is assigned later by StartMonitoringServer, so the registration dereferenced a nil *MetricsSetup.

Add nil-receiver guards to the MetricsSetup registration methods (RegisterMetricsGauge/GaugeFunc/Counter, RegisterFloatCounter, RegisterMetricsSummary/Histogram), matching their existing 'return a dummy to prevent panics' contract. The guard is a no-op for non-nil receivers, so existing callers are unaffected. The breaker and the admin dashboard (which reads gobreaker state directly) keep working.

Add regression tests for the nil-receiver methods and for initCircuitBreaker with nil monitoring.

monitoring/monitoring.go

@@ -109,6 +109,11 @@ func (ms *MetricsSetup) ListActiveMetrics() []string {
 }
 
 func (ms *MetricsSetup) RegisterMetricsGauge(metric_name string, labels map[string]string, val float64) *metrics.Gauge {
+	if ms == nil {
+		// Monitoring may not be initialized yet (e.g. during config parsing,
+		// before the monitoring server starts). Return a dummy to prevent panics.
+		return &metrics.Gauge{}
+	}
 	if err := validate_metrics_name(metric_name); err != nil {
 		log.Error(&libpack_logger.LogMessage{
 			Message: "RegisterMetricsGauge() error - invalid metric name",
@@ -125,6 +130,9 @@ func (ms *MetricsSetup) RegisterMetricsGauge(metric_name string, labels map[stri
 // RegisterMetricsGaugeFunc registers a gauge with a callback function that is called on every scrape
 // This is useful for metrics that need to return a dynamic value
 func (ms *MetricsSetup) RegisterMetricsGaugeFunc(metric_name string, labels map[string]string, fn func() float64) *metrics.Gauge {
+	if ms == nil {
+		return &metrics.Gauge{}
+	}
 	if err := validate_metrics_name(metric_name); err != nil {
 		log.Error(&libpack_logger.LogMessage{
 			Message: "RegisterMetricsGaugeFunc() error - invalid metric name",
@@ -137,6 +145,9 @@ func (ms *MetricsSetup) RegisterMetricsGaugeFunc(metric_name string, labels map[
 }
 
 func (ms *MetricsSetup) RegisterMetricsCounter(metric_name string, labels map[string]string) *metrics.Counter {
+	if ms == nil {
+		return &metrics.Counter{}
+	}
 	if err := validate_metrics_name(metric_name); err != nil {
 		log.Error(&libpack_logger.LogMessage{
 			Message: "RegisterMetricsCounter() error - invalid metric name",
@@ -152,6 +163,9 @@ func (ms *MetricsSetup) RegisterMetricsCounter(metric_name string, labels map[st
 }
 
 func (ms *MetricsSetup) RegisterFloatCounter(metric_name string, labels map[string]string) *metrics.FloatCounter {
+	if ms == nil {
+		return &metrics.FloatCounter{}
+	}
 	if err := validate_metrics_name(metric_name); err != nil {
 		log.Error(&libpack_logger.LogMessage{
 			Message: "RegisterFloatCounter() error - invalid metric name",
@@ -164,6 +178,9 @@ func (ms *MetricsSetup) RegisterFloatCounter(metric_name string, labels map[stri
 }
 
 func (ms *MetricsSetup) RegisterMetricsSummary(metric_name string, labels map[string]string) *metrics.Summary {
+	if ms == nil {
+		return &metrics.Summary{}
+	}
 	if err := validate_metrics_name(metric_name); err != nil {
 		log.Error(&libpack_logger.LogMessage{
 			Message: "RegisterMetricsSummary() error - invalid metric name",
@@ -176,6 +193,9 @@ func (ms *MetricsSetup) RegisterMetricsSummary(metric_name string, labels map[st
 }
 
 func (ms *MetricsSetup) RegisterMetricsHistogram(metric_name string, labels map[string]string) *metrics.Histogram {
+	if ms == nil {
+		return &metrics.Histogram{}
+	}
 	if err := validate_metrics_name(metric_name); err != nil {
 		log.Error(&libpack_logger.LogMessage{
 			Message: "RegisterMetricsHistogram() error - invalid metric name",

monitoring/nil_safety_test.go

@@ -0,0 +1,25 @@
+package libpack_monitoring
+
+import (
+	"testing"
+
+	"github.com/stretchr/testify/require"
+)
+
+// TestRegistrationMethods_NilReceiver_NoPanic verifies that the metric
+// registration methods tolerate a nil *MetricsSetup receiver. Callers may
+// register metrics before the monitoring server has constructed the global
+// MetricsSetup (e.g. circuit breaker init during config parsing); these
+// methods must return a non-nil dummy instead of panicking.
+func TestRegistrationMethods_NilReceiver_NoPanic(t *testing.T) {
+	var ms *MetricsSetup // nil
+
+	require.NotPanics(t, func() {
+		require.NotNil(t, ms.RegisterMetricsGauge("g", nil, 1))
+		require.NotNil(t, ms.RegisterMetricsGaugeFunc("gf", nil, func() float64 { return 1 }))
+		require.NotNil(t, ms.RegisterMetricsCounter("c", nil))
+		require.NotNil(t, ms.RegisterFloatCounter("fc", nil))
+		require.NotNil(t, ms.RegisterMetricsSummary("s", nil))
+		require.NotNil(t, ms.RegisterMetricsHistogram("h", nil))
+	})
+}