Make Scope work with Proteus

[Serabe]

Repo: https://github.com/kinvolk/scope/tree/alban/proteus

The problem is related to map[string]SomeStruct, given the value type is not nullable and protobuf expects so. I'm investigating an option for gogo/protobuf to allow a value type to be nullable in a map.

Current problems:

• report/generated.pb.go:535: cannot convert nil to type Metric
• report/generated.pb.go:545: cannot convert nil to type Metric
• report/generated.pb.go:1057: cannot convert nil to type Node
• report/generated.pb.go:1067: cannot convert nil to type Node
• report/generated.pb.go:1085: cannot convert nil to type Control
• report/generated.pb.go:1095: cannot convert nil to type Control
• report/generated.pb.go:1113: cannot convert nil to type MetadataTemplate
• report/generated.pb.go:1123: cannot convert nil to type MetadataTemplate
• report/generated.pb.go:1141: cannot convert nil to type MetricTemplate
• report/generated.pb.go:1151: cannot convert nil to type MetricTemplate

[alban]

@Serabe Thanks for looking at this!

Upstream repo: https://github.com/weaveworks/scope/ Scope issue about trying Proteus: https://github.com/weaveworks/scope/issues/2433

/cc @2opremio @schu @iaguis

[Serabe]

Updated text and removed the EPIC label since they are all the same problem.

[Serabe]

@alban I submitted this morning a PR to alban/proteus https://github.com/kinvolk/scope/pull/5

Basically, I fixed all the problems I found and made a new release. Then, I did a make clean to make sure everything was removed properly and tried again. I also added some files from gogo/protobuf that are really needed (those can be found in the PR).

Thank you!