Alerts for Fetch METS failures and method to retry.

[peterVG]

AIPScan is intended to be able to scan large volumes of AIPs. We need to expect that some AIPs will not be retrieved or parsed correctly. We need to define requirements for catching & managing these types of errors (could include manual error handling workflows)

[mcantelon]

We could do this to add error reporting:

• Add "FetchJobError" ORM object/"fetch_job_error" table, to record each fetch job error, with fetch job ID, error type, error details, and error date/time
• Add "Errors" column to storage service page's fetch job list in which the number of errors is shown
• If there were any errors make the number of errors link to a web page showing the details of each error

Subsequent to that we could see whether adding recovery handling is worth it.