In Spring-Boot 2.4, I have this problem with the Actuator health endpoint and readiness probe. When one of my custom key components is down, the /health/readiness endpoint says DOWN and the /health endpoint too, but the readinessState detail of /health still says UP.
Why is it that way? Shouldn't readinessState say DOWN too?
None of the many tutorials I found online seem to address this question.
My hypothesis: the readinessState has nothing to do with readiness and exposes another piece of information. I hope I'm wrong, because it would be nonesense and what I understand of the code seems to indicate otherwise.
More about my configuration:
Relevant excerpt from application.yml
management:
endpoints:
web:
base-path: /
endpoint:
health:
show-details: ALWAYS
probes:
enabled: true
group:
readiness:
include: db, myCustom, diskSpace
And when I make myCustom go DOWN, following results appear:
GET /health
{
"status": "DOWN",
"components": {
..., // other components
"myCustom": {
"status": "DOWN"
},
"readinessState": {
"status": "UP" // here UP
}
},
"groups": [
"liveness",
"readiness"
]
}
GET /health/readiness
{
"status": "DOWN", // but here DOWN
"components": {
..., // other components
"myCustom": {
"status": "DOWN"
}
}
}
The readiness state only monitors specific health groups. It needs to be told about your custom component.
By default, Spring Boot does not add other Health Indicators to these groups.