Nodegraph throws exception when nodes and edges datasets are empty

[nikhithachinthapall1]

how to handle Grafana node graph throwing exception when nodes and edge datasets are empty?

• What Grafana version and what operating system are you using?
  version 12.2

• What are you trying to achieve?
  Nodegraph visualization

• How are you trying to achieve it?
  Querying prometheus metrics using two seperate queries to get two datasets nodes and edges

• What happened?
  There are instances when my datasets have no data. In such a case the node graph throws exception saying it’s looking for an “id” column.

  I did use a workaround by creating dummy node and edges, so the panel shows “No Connections” instead of throwing exceptions. I just want to know if there’s a better way to handle this.

  Nodes:
  (
label_replace(
label_replace(
vector(0),
“id”,“no-data”,“”,“”
),
“title”,“No Agents Connected”,“”,“”
)
)
unless
<my actual query>

  Edges:
  (
label_replace(
label_replace(
label_replace(
vector(0),
“id”,“no-edge”,“”,“”
),
“source”,“no-data”,“”,“”
),
“target”,“no-data”,“”,“”
)
)
unless
<My actual query>

  

• What did you expect to happen?
  Show “No Data” when datasets are empty

• Can you copy/paste the configuration(s) that you are having problems with?

• Did you receive any errors in the Grafana UI or in related logs? If so, please tell us exactly what they were.

  

• Did you follow any online instructions? If so, what is the URL?
  Node graph | Grafana documentation

[infofcc3]

Try this..

Nodes:

(
label_replace(vector(0), “id”, “no-data”, “”, “”)
|> label_replace(“title”, “No Agents Connected”, “”, “”)
)
unless
(<your_query>)

Edges:

(
label_replace(vector(0), “id”, “no-edge”, “”, “”)
|> label_replace(“source”, “no-data”, “”, “”)
|> label_replace(“target”, “no-data”, “”, “”)
)
unless
(<your_query>)

Node graph | Grafana documentation

[nikhithachinthapall1]

Thank you, that worked