An enum detailing the possible reasons a case may be
escalated.
Values:
REASON_UNSPECIFIED (0):
The escalation reason is in an unknown state
or has not been specified.
RESOLUTION_TIME (1):
The case is taking too long to resolve.
TECHNICAL_EXPERTISE (2):
The support agent does not have the expertise
required to successfully resolve the issue.
BUSINESS_IMPACT (3):
The issue is having a significant business
impact.
