diff --git a/korrel8r/korrel8r-openapi.yaml b/korrel8r/korrel8r-openapi.yaml
index 2559cd6..36997e0 100644
--- a/korrel8r/korrel8r-openapi.yaml
+++ b/korrel8r/korrel8r-openapi.yaml
@@ -17,6 +17,7 @@ info:
     name: Apache 2.0
     url: https://github.com/korrel8r/korrel8r/blob/main/LICENSE
   version: v1alpha1
+  x-korrel8r-version: "0.10.1-dev"
 externalDocs:
   url: https://korrel8r.github.io/korrel8r/
   description: Korrel8r User Guide
@@ -294,6 +295,13 @@ paths:
           required: true
           schema:
             $ref: "#/components/schemas/Query"
+        - name: constraint
+          description: Constrains the objects that will be included in results.
+          in: query
+          style: form
+          explode: true
+          schema:
+            $ref: "#/components/schemas/Constraint"
       responses:
         "200":
           description: OK
@@ -399,7 +407,6 @@ components:
     Constraint:
       description: Constrains the objects that will be included in search results.
       type: object
-      x-go-type: korrel8r.Constraint
       properties:
         start:
           type: string
@@ -553,18 +560,24 @@ components:
           x-oapi-codegen-extra-tags:
             jsonschema: "Full class name in DOMAIN:CLASS format."
         queries:
-          type: array
-          x-go-type-skip-optional-pointer: true
           description: Queries yielding results for this class.
+          type: array
           items:
             $ref: "#/components/schemas/QueryCount"
+          x-go-type-skip-optional-pointer: true
           x-oapi-codegen-extra-tags:
             jsonschema: "Queries yielding results for this class."
         count:
-          type: integer
           description: Number of results for this class, after de-duplication.
+          type: integer
           x-oapi-codegen-extra-tags:
             jsonschema: "Number of results for this class, after de-duplication."
+        markers:
+          description: Markers found on data objects for this node.
+          type: array
+          items:
+            $ref: "#/components/schemas/MarkerCount"
+          x-go-type-skip-optional-pointer: true
         result:
           description: Serialized result contents, may be large.
           type: array
@@ -591,6 +604,18 @@ components:
           x-oapi-codegen-extra-tags:
             jsonschema: "Query for correlation data in DOMAIN:CLASS:SELECTOR format."
 
+    MarkerCount:
+      description: Marker with number of instances found.
+      type: object
+      required: [marker]
+      properties:
+        marker:
+          description: Marker for correlation data.
+          type: string
+        count:
+          description: Number of markers found, omitted if none.
+          type: integer
+
     Rule:
       type: object
       required: [name]
diff --git a/web/src/__tests__/types.spec.ts b/web/src/__tests__/types.spec.ts
index 9bdf8e9..2b745b9 100644
--- a/web/src/__tests__/types.spec.ts
+++ b/web/src/__tests__/types.spec.ts
@@ -147,6 +147,7 @@ describe('Node', () => {
           count: 5,
         },
       ],
+      markers: [],
     });
   });
 
diff --git a/web/src/components/topology/Korrel8rTopology.tsx b/web/src/components/topology/Korrel8rTopology.tsx
index f36066a..9bbe280 100644
--- a/web/src/components/topology/Korrel8rTopology.tsx
+++ b/web/src/components/topology/Korrel8rTopology.tsx
@@ -1,4 +1,4 @@
-import { Badge, Title } from '@patternfly/react-core';
+import { Badge, Label, LabelGroup, Title } from '@patternfly/react-core';
 import {
   action,
   ComponentFactory,
@@ -17,7 +17,9 @@ import {
   Model,
   ModelKind,
   Node,
+  NodeModel,
   NodeShape,
+  NodeStatus,
   SELECTION_EVENT,
   TOP_TO_BOTTOM,
   TopologyControlBar,
@@ -33,12 +35,13 @@ import {
   withSelection,
   WithSelectionProps,
 } from '@patternfly/react-topology';
+import { FC, useCallback, useEffect, useMemo, useRef, useState } from 'react';
 import { useTranslation } from 'react-i18next';
+import { useLocationQuery } from '../../hooks/useLocationQuery';
 import { useNavigateToQuery } from '../../hooks/useNavigateToQuery';
 import * as korrel8r from '../../korrel8r/types';
 import { getIcon } from '../icons';
 import './korrel8rtopology.css';
-import { FC, useCallback, useEffect, useMemo, useRef, useState } from 'react';
 
 // DagreLayout with straight edges (no angular bendpoints).
 class StraightEdgeDagreLayout extends DagreLayout {
@@ -56,14 +59,45 @@ const nodeLabel = (node: korrel8r.Node): string => {
   return capitalize(c.name);
 };
 
+const nodeStatusProps = (
+  node: korrel8r.Node,
+): {
+  nodeStatus?: NodeStatus;
+  showStatusDecorator?: boolean;
+  statusDecoratorTooltip?: React.ReactNode;
+} => {
+  if (node.disabled) {
+    return {
+      showStatusDecorator: true,
+      statusDecoratorTooltip: node.disabled,
+    };
+  }
+  if (node.hasMarkers) {
+    return {
+      nodeStatus: NodeStatus.warning,
+      showStatusDecorator: true,
+      statusDecoratorTooltip: (
+        <LabelGroup>
+          {node.markers.map(({ marker, count }) => (
+            <Label key={marker}>
+              {marker} <Badge className="tp-plugin__topology_marker_badge">{count}</Badge>
+            </Label>
+          ))}
+        </LabelGroup>
+      ),
+    };
+  }
+  return {};
+};
+
 interface Korrel8rTopologyNodeProps {
-  element: Node;
+  element: Node<NodeModel, korrel8r.Node>;
 }
 
 const Korrel8rTopologyNode: FC<
   Korrel8rTopologyNodeProps & WithContextMenuProps & WithSelectionProps & WithDragNodeProps
 > = ({ element, onSelect, selected, onContextMenu, contextMenuOpen, dragNodeRef }) => {
-  const node = element.getData();
+  const node: korrel8r.Node = element.getData();
   const topologyNode = (
     <DefaultNode
       element={element}
@@ -73,19 +107,22 @@ const Korrel8rTopologyNode: FC<
       contextMenuOpen={contextMenuOpen}
       dragNodeRef={dragNodeRef}
       hover={false}
+      className={node.disabled ? 'tp-plugin__topology_node--disabled' : undefined}
       label={nodeLabel(node)}
       badge={node?.count?.toString() ?? '?'}
       badgeClassName="tp-plugin__topology_node_badge"
       hideContextMenuKebab={node?.queries?.length === 1}
+      onStatusDecoratorClick={(e) => onSelect(e)}
+      {...nodeStatusProps(node)}
     >
-      <g transform={`translate(25, 25)`}>{getIcon(node.class)}</g>
+      <g transform={`translate(25, 25)`}>{getIcon(node?.class)}</g>
     </DefaultNode>
   );
-  if (node.error) {
-    // Gray out, add error tool tip
+  if (node.disabled) {
+    // Wrapper to make node gray with error tool tip.
     return (
       <g opacity="0.7" className="tp-plugin__topology_invalid_node">
-        <title>{node.error}</title>){topologyNode}
+        <title>{node.disabled}</title>){topologyNode}
       </g>
     );
   }
@@ -104,28 +141,34 @@ export const Korrel8rTopology: FC<{
 }> = ({ graph, loggingAvailable, netobserveAvailable, constraint }) => {
   const { t } = useTranslation('plugin__troubleshooting-panel-console-plugin');
   const navigateToQuery = useNavigateToQuery();
+  const locationQuery = useLocationQuery();
   const [selectedIds, setSelectedIds] = useState<string[]>([]);
 
-  const nodes = useMemo(
-    () =>
+  useEffect(() => {
+    if (!locationQuery) return;
+    const id = locationQuery.class.toString();
+    setSelectedIds(graph.node(id) ? [id] : []);
+  }, [graph, locationQuery]);
+
+  const nodes: NodeModel[] = useMemo(
+    (): NodeModel[] =>
       graph.nodes.map((node: korrel8r.Node) => {
-        const newNode = { ...node };
-        if (newNode.error) {
+        if (node.disabled) {
           // eslint-disable-next-line no-console
-          console.warn(`korrel8r node: ${newNode.error}`);
-          newNode.error = Error(t('Unable to find Console Link'));
-        } else if (newNode.class.domain === 'log' && !loggingAvailable) {
-          newNode.error = Error(t('Logging Plugin Disabled'));
-        } else if (newNode.class.domain === 'netflow' && !netobserveAvailable) {
-          newNode.error = Error(t('Netflow Plugin Disabled'));
+          console.warn(`korrel8r node: ${node.disabled}`);
+          node.disabled = t('Unable to find Console Link');
+        } else if (node.class.domain === 'log' && !loggingAvailable) {
+          node.disabled = t('Logging Plugin Disabled');
+        } else if (node.class.domain === 'netflow' && !netobserveAvailable) {
+          node.disabled = t('Netflow Plugin Disabled');
         }
         return {
-          id: newNode.id,
+          id: node.id,
           type: 'node',
           width: NODE_DIAMETER,
           height: NODE_DIAMETER,
           shape: NODE_SHAPE,
-          data: newNode,
+          data: node,
         };
       }),
     [graph, loggingAvailable, netobserveAvailable, t],
@@ -150,7 +193,7 @@ export const Korrel8rTopology: FC<{
       const id = selected?.[0]; // Select only one at a time.
       setSelectedIds([id]);
       const node = graph.node(id);
-      if (!node || node.error) return;
+      if (!node || node.disabled) return;
       navigateToQuery(node.queries?.[0]?.query, constraint);
     },
     [graph, navigateToQuery, setSelectedIds, constraint],
@@ -158,7 +201,7 @@ export const Korrel8rTopology: FC<{
 
   const nodeMenu = useCallback(
     (e: GraphElement<ElementModel, korrel8r.Node>): React.ReactElement[] => {
-      const node = e.getData();
+      const node: korrel8r.Node = e.getData();
       const menu = [
         <ContextMenuItem isDisabled={true} key={node.class.toString()}>
           <Title headingLevel="h4">{node.class.toString()}</Title>
@@ -173,9 +216,8 @@ export const Korrel8rTopology: FC<{
               setSelectedIds([node.id]);
               navigator.clipboard.writeText(qc.query.toString());
             }}
-            icon={<Badge>{`${qc.count} `}</Badge>}
           >
-            {`${qc.query.selector} `}
+            {qc.query.selector} <Badge>{`${qc.count}`}</Badge>
           </ContextMenuItem>,
         ),
       );
diff --git a/web/src/components/topology/korrel8rtopology.css b/web/src/components/topology/korrel8rtopology.css
index e9297b3..b2da3d7 100644
--- a/web/src/components/topology/korrel8rtopology.css
+++ b/web/src/components/topology/korrel8rtopology.css
@@ -1,7 +1,3 @@
-.tp-plugin__topology_invalid_node {
-  cursor: not-allowed;
-}
-
 .tp-plugin__topology_node_badge rect {
   fill: var(--pf-t--global--color--brand--default);
   stroke: var(--pf-t--global--color--brand--default);
@@ -10,3 +6,14 @@
 .tp-plugin__topology_node_badge text {
   fill: var(--pf-t--global--text--color--on-brand--default);
 }
+
+.tp-plugin__topology_marker_badge {
+  --pf-v6-c-badge--BackgroundColor: var(--pf-t--global--color--brand--default);
+  --pf-v6-c-badge--Color: var(--pf-t--global--text--color--on-brand--default);
+}
+
+.tp-plugin__topology_node--disabled {
+  opacity: 0.5;
+  filter: grayscale(100%);
+  pointer-events: auto;
+}
diff --git a/web/src/korrel8r/client/index.ts b/web/src/korrel8r/client/index.ts
index af98ba1..d0923b0 100644
--- a/web/src/korrel8r/client/index.ts
+++ b/web/src/korrel8r/client/index.ts
@@ -57,6 +57,7 @@ export type {
   ListGoalsErrors,
   ListGoalsResponse,
   ListGoalsResponses,
+  MarkerCount,
   Neighbors,
   Node,
   Object,
diff --git a/web/src/korrel8r/client/types.gen.ts b/web/src/korrel8r/client/types.gen.ts
index c810752..32ac2e3 100644
--- a/web/src/korrel8r/client/types.gen.ts
+++ b/web/src/korrel8r/client/types.gen.ts
@@ -142,6 +142,10 @@ export type Node = {
    * Number of results for this class, after de-duplication.
    */
   count?: number;
+  /**
+   * Markers found on data objects for this node.
+   */
+  markers?: Array<MarkerCount>;
   /**
    * Serialized result contents, may be large.
    */
@@ -162,6 +166,20 @@ export type QueryCount = {
   query: Query;
 };
 
+/**
+ * Marker with number of instances found.
+ */
+export type MarkerCount = {
+  /**
+   * Marker for correlation data.
+   */
+  marker: string;
+  /**
+   * Number of markers found, omitted if none.
+   */
+  count?: number;
+};
+
 /**
  * Rule is a correlation rule with a list of queries and results counts found during navigation.
  */
@@ -541,6 +559,10 @@ export type ObjectsData = {
      * Query string.
      */
     query: Query;
+    /**
+     * Constrains the objects that will be included in results.
+     */
+    constraint?: Constraint;
   };
   url: '/objects';
 };
diff --git a/web/src/korrel8r/types.ts b/web/src/korrel8r/types.ts
index a70067a..c81bfff 100644
--- a/web/src/korrel8r/types.ts
+++ b/web/src/korrel8r/types.ts
@@ -248,15 +248,18 @@ export const unixSeconds = (d: Date | undefined): number | undefined => {
   return Math.floor(unixMilliseconds(d) / 1000) || undefined;
 };
 
+export type MarkerCount = api.MarkerCount;
+
 export class Node {
   id: string;
   count: number;
   class: Class;
   queries: Array<QueryCount>;
-  error: Error;
+  markers: Array<MarkerCount>;
+  disabled: string;
 
   /** Construct a type-safe node from an API node.
-   *  Does not throw, sets the `error` field on error.
+   *  Does not throw, sets the `disabled` field if there is an error.
    */
   constructor(node: api.Node) {
     this.id = node.class;
@@ -264,9 +267,14 @@ export class Node {
     try {
       this.class = Class.parse(node.class);
     } catch (e) {
-      this.error = e;
+      this.disabled = e?.message ?? e.toString();
     }
     this.queries = QueryCount.array(node.queries ?? []);
+    this.markers = node.markers;
+  }
+
+  get hasMarkers(): boolean {
+    return this.markers?.length > 0;
   }
 }
 
@@ -342,6 +350,6 @@ export class Graph {
   }
 
   node(id: string): Node {
-    return this.nodeByClass[id];
+    return this.nodeByClass?.[id];
   }
 }