Support for Workloads as Nodes

[guhcampos]

Summary

The node creation dialog is oriented by entity Domain, but Workloads are not included.

Desired Behaviour

Workloads are a useful NR1 feature to abstract away complexity of some systems into black boxes. The feature fits perfectly in observability maps where we want to map how different systems connect to each other on a higher level.

Possible Solution

Probably have a Workload domain available in the dialog, so workloads may be chosen as nodes in an Observability Map.

Additional context