fix: address Copilot review comments

- Fix type assertion in TestCheckHealth to properly check assertion result
- Improve healthChannelBufferSize documentation for operators with >8 GPUs

Signed-off-by: Carlos Eduardo Arango Gutierrez <eduardoa@nvidia.com>

Author: ArangoGutierrez

internal/plugin/server.go

@@ -49,10 +49,12 @@ const (
 
 	// healthChannelBufferSize defines the buffer capacity for the health
 	// channel. This is sized to handle bursts of unhealthy device reports
-	// without blocking the health check goroutine. With 8 GPUs and
-	// potential for multiple events per GPU (XID errors, ECC errors, etc.),
-	// a buffer of 64 provides ample headroom while using a power-of-2 size
-	// for cache-friendly alignment.
+	// without blocking the health check goroutine. The value of 64 is
+	// chosen assuming a single device plugin instance runs per node with
+	// up to 8 GPUs per node and multiple in-flight events per GPU (XID
+	// errors, ECC errors, etc.), while keeping a power-of-2 size for
+	// cache-friendly alignment. Operators running nodes with significantly
+	// more GPUs should review this assumption.
 	healthChannelBufferSize = 64
 )
 

internal/rm/health_test.go

@@ -231,13 +231,13 @@ func TestCheckHealth(t *testing.T) {
 
 	server := dgxa100.New()
 
-	if deviceMock := server.Devices[0].(*dgxa100.Device); true {
-		deviceMock.GetSupportedEventTypesFunc = func() (uint64, nvml.Return) {
-			return nvml.EventTypeXidCriticalError, nvml.SUCCESS
-		}
-		deviceMock.RegisterEventsFunc = func(v uint64, eventSet nvml.EventSet) nvml.Return {
-			return nvml.SUCCESS
-		}
+	deviceMock, ok := server.Devices[0].(*dgxa100.Device)
+	require.True(t, ok, "expected first device to be *dgxa100.Device")
+	deviceMock.GetSupportedEventTypesFunc = func() (uint64, nvml.Return) {
+		return nvml.EventTypeXidCriticalError, nvml.SUCCESS
+	}
+	deviceMock.RegisterEventsFunc = func(v uint64, eventSet nvml.EventSet) nvml.Return {
+		return nvml.SUCCESS
 	}
 
 	var count int