add more error check and type assertion

Signed-off-by: charleslin-appd <[email protected]>

pkg/metrics/providers/appdynamicscloud.go

@@ -151,7 +151,13 @@ func (p *AppDynamicsCloudProvider) RunQuery(query string) (float64, error) {
  return 0, fmt.Errorf("invalid response: %s: %w", string(body), ErrNoValuesFound)
  }
 
- return metric[1].(float64), nil
+ // assert the second item of the array is numeric and return
+ r, ok := metric[1].(float64)
+ if ok {
+ return r, nil
+ } else {
+ return 0, fmt.Errorf("failed to retrieve numeric result: %s: %w", query, ErrNoValuesFound)
+ }
 }
 
 // IsOnline calls the Appdynamics Cloud's metrics endpoint with client ID and