Implement "Prometheus mode" for better micrometer->OTel->Prometheus support #5537
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trask
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...java/io/opentelemetry/instrumentation/micrometer/v1_5/OpenTelemetryMeterRegistryBuilder.java
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…upport (open-telemetry#5537) * Implement "Prometheus mode" for better micrometer->OTel->Prometheus support * code review comments * forgot about README
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This is another part of the solution to #5292. It does not completely fix that issue, there are still two problems remaining:
LongTaskTimerdoes not really match any OTel instrument well - we're not using an OTel histogram for it (because OTel histogram is for finished records, while this one is supposed to show the ones still inflight). This one instrument would benefit from Bogdan'sMetricProduceridea, but that's almost impossible to implement as javaagent instrumentation. I don't really have any good idea on how to handle that, so for now we'll have to accept that it's not a perfect shim.I'll copy that PR over to the SDK repo once open-telemetry/opentelemetry-java#4258 is merged.