Currently we maintain 2 defaultList of metrics depending upon whether loki is enabled:

https://github.com/netobserv/network-observability-operator/blob/main/pkg/metrics/predefined_metrics.go#L37-L55 , this causes errors like below when switching between datasources when Loki is enabled:

While users are not likely to actively switch between datasources, we could simplify the default list to become one that can be used regardless whether loki is being used. This will help for testing and validation of correctness between datasources as well.