test: cover daemon telemetry publication

cmd/rvbox/main.go

@@ -255,15 +255,7 @@ func publishClientTelemetry(ctx context.Context, state *spool.Store, health *obs
 	ticker := time.NewTicker(10 * time.Second)
 	defer ticker.Stop()
 	for {
-		sampleContext, cancel := context.WithTimeout(ctx, time.Second)
-		telemetry, err := state.Telemetry(sampleContext)
-		cancel()
-		if err != nil {
-			health.Inc("telemetry_read_failure")
-		} else {
-			health.SetGauge("queue_depth", float64(telemetry.QueuedCommands))
-			health.SetGauge("client_spool_bytes", float64(telemetry.ChargedBytes))
-		}
+		publishClientTelemetrySample(ctx, state.Telemetry, health)
 		select {
 		case <-ctx.Done():
 			return
@@ -272,6 +264,21 @@ func publishClientTelemetry(ctx context.Context, state *spool.Store, health *obs
 	}
 }
 
+// publishClientTelemetrySample performs one intentionally bounded, best-effort
+// telemetry read. An unavailable spool metric must not interrupt reconnect or
+// command supervision.
+func publishClientTelemetrySample(ctx context.Context, read func(context.Context) (spool.Telemetry, error), health *observability.Health) {
+	sampleContext, cancel := context.WithTimeout(ctx, time.Second)
+	telemetry, err := read(sampleContext)
+	cancel()
+	if err != nil {
+		health.Inc("telemetry_read_failure")
+		return
+	}
+	health.SetGauge("queue_depth", float64(telemetry.QueuedCommands))
+	health.SetGauge("client_spool_bytes", float64(telemetry.ChargedBytes))
+}
+
 func clientJobProfiles(profiles config.Profiles) map[string]clientwindows.JobProfile {
 	return map[string]clientwindows.JobProfile{
 		rvboxv1.ExecutionProfile_EXECUTION_PROFILE_LIGHT.String():       toJobProfile(profiles.Light),

cmd/rvbox/main_test.go

@@ -2,11 +2,15 @@ package main
 
 import (
 	"bytes"
+	"context"
+	"errors"
 	"net/http"
 	"net/http/httptest"
 	"testing"
 
+	"github.com/rvbox/rvbox/internal/client/spool"
 	"github.com/rvbox/rvbox/internal/config"
+	"github.com/rvbox/rvbox/internal/observability"
 )
 
 func TestClientModeSelectionRequiresExactlyOneMode_HP_WINCLI_01(t *testing.T) {
@@ -77,3 +81,27 @@ func TestNonWindowsServiceModesRemainExplicitlyUnsupported_BH_WINCLI_01(t *testi
 		t.Fatal("non-Windows tray mode unexpectedly available")
 	}
 }
+
+func TestPublishClientTelemetrySample_HP_OPS_07(t *testing.T) {
+	t.Parallel()
+	health := observability.New()
+	publishClientTelemetrySample(context.Background(), func(context.Context) (spool.Telemetry, error) {
+		return spool.Telemetry{QueuedCommands: 2, ChargedBytes: 2048}, nil
+	}, health)
+	snapshot := health.MetricsSnapshot()
+	if snapshot.Gauges["queue_depth"] != 2 || snapshot.Gauges["client_spool_bytes"] != 2048 {
+		t.Fatalf("client telemetry gauges = %#v", snapshot.Gauges)
+	}
+}
+
+func TestPublishClientTelemetrySampleFailure_BH_OPS_04(t *testing.T) {
+	t.Parallel()
+	health := observability.New()
+	publishClientTelemetrySample(context.Background(), func(context.Context) (spool.Telemetry, error) {
+		return spool.Telemetry{}, errors.New("spool unavailable")
+	}, health)
+	_, _, counters := health.Snapshot()
+	if counters["telemetry_read_failure"] != 1 {
+		t.Fatalf("telemetry failure counters = %#v", counters)
+	}
+}