feat: introduce pool-level rebalance (#15483)

cmd/rebalancemetric_string.go

@@ -0,0 +1,27 @@
+// Code generated by "stringer -type=rebalanceMetric -trimprefix=rebalanceMetric erasure-server-pool-rebalance.go"; DO NOT EDIT.
+
+package cmd
+
+import "strconv"
+
+func _() {
+	// An "invalid array index" compiler error signifies that the constant values have changed.
+	// Re-run the stringer command to generate them again.
+	var x [1]struct{}
+	_ = x[rebalanceMetricRebalanceBuckets-0]
+	_ = x[rebalanceMetricRebalanceBucket-1]
+	_ = x[rebalanceMetricRebalanceObject-2]
+	_ = x[rebalanceMetricRebalanceRemoveObject-3]
+	_ = x[rebalanceMetricSaveMetadata-4]
+}
+
+const _rebalanceMetric_name = "RebalanceBucketsRebalanceBucketRebalanceObjectRebalanceRemoveObjectSaveMetadata"
+
+var _rebalanceMetric_index = [...]uint8{0, 16, 31, 46, 67, 79}
+
+func (i rebalanceMetric) String() string {
+	if i >= rebalanceMetric(len(_rebalanceMetric_index)-1) {
+		return "rebalanceMetric(" + strconv.FormatInt(int64(i), 10) + ")"
+	}
+	return _rebalanceMetric_name[_rebalanceMetric_index[i]:_rebalanceMetric_index[i+1]]
+}