remove blocking backend check

- threw errors on expected and correctly handled behavior for nodeList queries

internal/repository/node.go

@@ -11,6 +11,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"slices"
+	"sort"
 	"strings"
 	"sync"
 	"time"
@@ -683,6 +684,11 @@ func (r *NodeRepository) GetNodesForList(
 		hasNextPage = len(nextNodes) == 1
 	}
 
+	// Fallback, ignores stateFilter
+	// if countNodes == 0 {
+	// 	nodes, countNodes, hasNextPage = getNodesFromTopol(cluster, subCluster, nodeFilter, page)
+	// }
+
 	return nodes, stateMap, countNodes, hasNextPage, nil
 }
 
@@ -707,3 +713,51 @@ func AccessCheckWithUser(user *schema.User, query sq.SelectBuilder) (sq.SelectBu
 		return qnil, fmt.Errorf("user has no or unknown roles")
 	}
 }
+
+func getNodesFromTopol(cluster string, subCluster string, nodeFilter string, page *model.PageRequest) ([]string, int, bool) {
+	// 0) Init additional vars
+	var hasNextPage bool = false
+	var totalNodes int = 0
+
+	// 1) Get list of all nodes
+	var topolNodes []string
+	if subCluster != "" {
+		scNodes := archive.NodeLists[cluster][subCluster]
+		topolNodes = scNodes.PrintList()
+	} else {
+		subClusterNodeLists := archive.NodeLists[cluster]
+		for _, nodeList := range subClusterNodeLists {
+			topolNodes = append(topolNodes, nodeList.PrintList()...)
+		}
+	}
+
+	// 2) Filter nodes
+	if nodeFilter != "" {
+		filteredNodes := []string{}
+		for _, node := range topolNodes {
+			if strings.Contains(node, nodeFilter) {
+				filteredNodes = append(filteredNodes, node)
+			}
+		}
+		topolNodes = filteredNodes
+	}
+
+	// 2.1) Count total nodes && Sort nodes -> Sorting invalidated after ccms return ...
+	totalNodes = len(topolNodes)
+	sort.Strings(topolNodes)
+
+	// 3) Apply paging
+	if len(topolNodes) > page.ItemsPerPage {
+		start := (page.Page - 1) * page.ItemsPerPage
+		end := start + page.ItemsPerPage
+		if end >= len(topolNodes) {
+			end = len(topolNodes)
+			hasNextPage = false
+		} else {
+			hasNextPage = true
+		}
+		topolNodes = topolNodes[start:end]
+	}
+
+	return topolNodes, totalNodes, hasNextPage
+}

pkg/metricstore/query.go

@@ -912,9 +912,6 @@ func buildNodeQueries(
 	scopes []schema.MetricScope,
 	resolution int64,
 ) ([]APIQuery, []schema.MetricScope, error) {
-	if len(nodes) == 0 {
-		return nil, nil, fmt.Errorf("METRICDATA/CCMS > no nodes specified for query")
-	}
 
 	queries := make([]APIQuery, 0, len(metrics)*len(scopes)*len(nodes))
 	assignedScope := []schema.MetricScope{}