To get all nodes count:
query {
counter(func: has(dgraph.type)) {
count(uid)
}
}
Edges are facets in dgraph, so you need to use the @facet directive
https://dgraph.io/docs/query-language/facets/
and more on counters:
https://dgraph.io/docs/query-language/count/
For specific questions, I suggest you get on the discord to get a quick answer:
J