Noticed this when looking at the list of 500s, wmfwiki receives some malformed csp reports to which mediawiki replies with 500, IMO it should be a 400 since it is client-provided data we are trying to parse.
"message": "Error reading CSP report: wrongformat", "url": "/w/api.php?action=cspreport&format=none&reportonly=1&source=wmfwiki&", "method": "ApiCSPReport::verifyPostBodyOk", "channel": "csp-report-only", "reqId": "WSWDmQpAEDEAAULovFQAAADG",