L1     - Guava InMemory - Expires in 1 HOUR
L2     - Redis cache    - Expires in 1 DAY
SOURCE - REST endpoint

#	L1 - InMemory	L2 - Redis	Source	L1 expected	L2 expected	Source expected	Expected result
1	FRESH	FRESH / EXPIRED	UP / DOWN	not updated	not updated	not queried	IN_MEMORY
2	EXPIRED	FRESH	UP	updated	updatedc1	200_OK	SOURCE
3	EXPIRED	EXPIRED	UP	updated	updated	200_OK	SOURCE
4	EXPIRED	DOWN	UP	updated	not updated	200_OK	SOURCE
5	EXPIRED	FRESH	DOWN	not updated	not updated	5xx_...	REDIS
6	EXPIRED	EXPIRED	DOWN	not updated	not updated	5xx_...	5xx_...

^c1 if it is NOT updated, then we don't gain 1 DAY downtime support