🐛(metrics) Initialize metrics for autoscaler errors, scale events, an…

…d pod evictions

- Set initial count to zero for various autoscaler error types (e.g., CloudProviderError, ApiCallError)
- Define failed scale-up reasons and initialize metrics (e.g., CloudProviderError, APIError)
- Initialize pod eviction result counters for success and failure cases
- Initialize skipped scale events for CPU and memory resource limits in both scale-up and scale-down directions

Signed-off-by: Thiha Min Thant <thihaminthant20@gmail.com>

cluster-autoscaler/main.go

@@ -608,6 +608,9 @@ func buildAutoscaler(context ctx.Context, debuggingSnapshotter debuggingsnapshot
 	metrics.UpdateCPULimitsCores(autoscalingOptions.MinCoresTotal, autoscalingOptions.MaxCoresTotal)
 	metrics.UpdateMemoryLimitsBytes(autoscalingOptions.MinMemoryTotal, autoscalingOptions.MaxMemoryTotal)
 
+	// Initialize metrics.
+	metrics.InitMetrics()
+
 	// Create autoscaler.
 	autoscaler, err := core.NewAutoscaler(opts, informerFactory)
 	if err != nil {

cluster-autoscaler/metrics/metrics.go

@@ -473,6 +473,28 @@ func RegisterAll(emitPerNodeGroupMetrics bool) {
 	}
 }
 
+// InitMetrics initializes all metrics
+func InitMetrics() {
+	for _, errorType := range []errors.AutoscalerErrorType{errors.CloudProviderError, errors.ApiCallError, errors.InternalError, errors.TransientError, errors.ConfigurationError, errors.NodeGroupDoesNotExistError, errors.UnexpectedScaleDownStateError} {
+		errorsCount.WithLabelValues(string(errorType)).Add(0)
+	}
+
+	for _, reason := range []FailedScaleUpReason{CloudProviderError, APIError, Timeout} {
+		scaleDownCount.WithLabelValues(string(reason)).Add(0)
+		failedScaleUpCount.WithLabelValues(string(reason)).Add(0)
+	}
+
+	for _, result := range []PodEvictionResult{PodEvictionSucceed, PodEvictionFailed} {
+		evictionsCount.WithLabelValues(string(result)).Add(0)
+	}
+
+	skippedScaleEventsCount.WithLabelValues(DirectionScaleDown, CpuResourceLimit).Add(0)
+	skippedScaleEventsCount.WithLabelValues(DirectionScaleDown, MemoryResourceLimit).Add(0)
+	skippedScaleEventsCount.WithLabelValues(DirectionScaleUp, CpuResourceLimit).Add(0)
+	skippedScaleEventsCount.WithLabelValues(DirectionScaleUp, MemoryResourceLimit).Add(0)
+
+}
+
 // UpdateDurationFromStart records the duration of the step identified by the
 // label using start time
 func UpdateDurationFromStart(label FunctionLabel, start time.Time) {