In the replica catalog, we will need to add metadata in there. As it stands, a replica catalog entry is as follows:
{
site: <string>,
lfn: <string>,
pfn: <string>,
checksum:

{ type: <string>, value: <string> }

}

Per 5/18 dev meeting (https://docs.google.com/document/d/1URPG6SLG481Y7DDAajjVtedKjS5pwIQ41UOhwSQYbhk/edit#bookmark=id.6b8rt2t6hoti) we have decided to go with:

replicas:
[
{
lfn: <string>,
pfns: [

{ site: <string>, path: <string> }

, ...
],
checksum:

{ sha256: <string> }

,
metadata:

{ k: v, ... }

}
]