Resolved
We have deployed a patch to XTZ reporting, all routes should now behave normally.
Identified
Currently if called with the validators & delegator parameter and a start & end dates the /rewards route for XTZ will return an error.
i.e. /v1/xtz/rewards?validators=....&delegators=...&start_date=...&end_date=... will return a 500 error
We are preparing a fix.