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• User time clock
  Sometimes we need user time clock to do statistics based on message time instead of system time, this is especially useful when analysis historical data
• Tagged metric name
  In eagle, tags is part of metric key(metricKey=metricName+tags+timestamp), which in dropwizard, metric key type is fixed as string, we need to do some encoding/decoding

   

So in order to solve the above problem, we extended dropwizard metric framework, the main change is using push mode to flush metric instead of pull mode to avoid contention issue(In dropwizard metric framework, it start a thread running metric reporter for metric status checking and flushing)

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