G Suite (Admin) Activity Monitoring encountered intermittent errors accessing the Google API

The Google Discovery API unexpectedly began returning malformed identifiers in a portion of API responses causing Google's SDKs to reject the data received. The impacted URL, https://www.googleapis.com/discovery/v1/apis/admin/reports_v1/rest, caused Google's SDK to cache an incorrect schema, requiring the cache to be cleared manually for the impacted workers (a minority of our cluster). This issue only impacted retrieving changes and publishing webhooks for Admin Google Drive accounts that monitored org-wide activity. This issue is now resolved and has been escalated to the G Suite team to note the concern with errors of this nature.