ivanjunckes commented on issue #2: GERONIMO-6658 - WIP Fix bug with gauge json URL: https://github.com/apache/geronimo-metrics/pull/2#issuecomment-442816821 I actually now get it, but adding map there doesn't work: return ofNullable(metricRegistry.getMetrics().get(name)) .map(metric -> singletonMap(name, map(metric))) .orElseGet(Collections::emptyMap); It will change the return type from Metric to Object and won't work for other methods that are using it.
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