infinispan-micrometer-reproducer

Reproduces bug in Infinispan / Micrometer, ticket: infinispan/infinispan#13133

How to reproduce

This is an almost empty project created with https://start.spring.io, all I did was adding infinispan-spring-boot3-starter-embedded.

Just start MicrometerReproducerApplication#main() and open up the Actuator endpoint: http://localhost:8082/actuator/prometheus?includedNames=cache_puts_total

You will see this error in the logs:
java.lang.IllegalArgumentException: -1.0: counters cannot have a negative value

Now edit the pom.xml, and switch to version 1.12.11 for micrometer-registry-prometheus.

Start the application again, open the Actuator endpoint and see actual data:
cache_puts_total{cache="default",cache_manager="springEmbedded",name="default",} -1.0

Micrometer clearly changed the behavior to no longer support negative values. I see some solutions:

1. Disable the default cache -> I did not find any way to do this
2. Activate statistics for the default cache -> I did not find any way to do this, either
3. Report this to Micrometer -> I actually don't think this is a bug on their side, negative values are just not a real metric