I have the 1.1.0 agent running as -javaagent with my java 1.8 app. I can see transactions in the apm UI (and in the apm-* index I can see "transaction" and "span" in the processor.index field).. but no metrics.
Version 1.1.0 is approaching a year old - I would recommend updating to the latest version, 1.9.0, which has accumulated numerous features and bug fixes.
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