YAML deploy of derived metrics failed when the namespace is new

[anhqle]

Consider the following derived metric, namespace.derived, which is defined as namespace.metric * 2

There are 2 dependencies: namespace.metric and namespace (where namespace is speculatively a dependency because of the rsplit code to accommodate the case where it's a dimension node)

Now DJ will check if any of these dependencies is unsatisfied

If namespace.metric is NOT part of the deployment:

• namespace.metric -> found it in external system, satisfied
• namespace -> is the start of namespace.metric, satisfied

If namespace.metric is part of the deployment:

• namespace.metric -> satisfied
• namespace -> unsatisfied (but DJ is wrong)

So we have a bug where namespace is wrongly declared an unsatisfied dependency