Flow and Process error reports

[waltjones]

Salesforce reports errors in Flows and Processes by sending error emails. These are routed to the same email handler as Apex Exception reports, however the format is very different.

We use the fromName property to detect which email type is being handled, and route to the correct parser class.

Flow and Process emails do not contain stack traces or a code-level error location. Rather they contain a list of log entries of the user actions leading up to the error, as well as metadata about the state of the Flow at the time of the error. This fits well with the way telemetry is used in Rollbar occurrences, and so these are converted to a list of telemetry events in the payload, with type='log'.

The log entries in the email body are generally unstructured text. There are always one or more lines of whitespace between each, so these newlines are the marker used to separate each message into a separate telemetry event.

While the Exception emails use only the plain text part of the email body, the Flow/Process emails use only the html part. On inspection, the html is not reliably valid, however tag stripping can be performed reliably. The body is tag stripped, and then treated as plain text.

The email title contains the description of the error itself, and this is used as the error message in the occurrence.

[austenLacy]

LGTM Nice work @waltjones!