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Steps to Reproduce:

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1. Build and deploy WAR: https://github.com/rsvoboda/rsvoboda-playground/tree/master/microprofile-metrics-hello-prometheus
2. curl http://localhost:8080/hello-prometheus/resources/coffee/stats

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1. Build and deploy WAR: https://github.com/rsvoboda/rsvoboda-playground/tree/master/microprofile-metrics-hello-prometheus 2. curl http://localhost:8080/hello-prometheus/resources/coffee/stats
Workaround Description:

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Us Metadata constructor that will set "reusable" flag: https://github.com/eclipse/microprofile-metrics/blob/branch-1.1/api/src/main/java/org/eclipse/microprofile/metrics/Metadata.java#L253

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Us Metadata constructor that will set "reusable" flag: https://github.com/eclipse/microprofile-metrics/blob/branch-1.1/api/src/main/java/org/eclipse/microprofile/metrics/Metadata.java#L253
Git Pull Request:
https://github.com/smallrye/smallrye-metrics/pull/71

Counter - registry.counter(metadata) returns IllegalArgumentException on second invocation of the endpoint. The same app works fine on Open Liberty.

JavaDoc for counter(Metadata metadata) says @return a new or pre-existing @link Counter.
Second invocation should return the pre-existing counter.

is incorporated by

WFLY-12137 Upgrade MP Metrics to 2.0-1.0.0