The case Priority. P0 is most urgent and P4 the least.
Values:
PRIORITY_UNSPECIFIED (0):
Priority is undefined or has not been set
yet.
P0 (1):
Extreme impact on a production service.
Service is hard down.
P1 (2):
Critical impact on a production service.
Service is currently unusable.
P2 (3):
Severe impact on a production service.
Service is usable but greatly impaired.
P3 (4):
Medium impact on a production service.
Service is available, but moderately impaired.
P4 (5):
General questions or minor issues.
Production service is fully available.
