The failure is due to the deprecation of setMetadata() in Builder. See rbac.proto

I tried to replace it with sourced_metadata but little did I know it takes some more effort from reading documents to adding a new parser for SOURCED_METADATA here

For now I can add a suppress warning for deprecation to the test method and create a tracking issue to this.

cc @ejona86 @kannanjgithub

We need to still support the old field, so @SuppressWarnings is appropriate. However, it is best to only suppress a single line. You can only do suppressions on declarations, though, so the code would need to change to be more like @SuppressWarnings("deprecation") Permission metadata = Permission.newBuilder().setMetadata(metadataMatcher).build(). Create a new issue to track implementing sourced_metadata.

(And implementing sourced_metadata would be cross-language, so would have a gRFC. The issue can mention that.)