Application Metrics

Dropwizard codahale Metrics

    MetricRegistry metricRegistry = new MetricRegistry();

    ConsoleReporter reporter =
        ConsoleReporter.forRegistry(metricRegistry).convertRatesTo(TimeUnit.SECONDS)
            .convertDurationsTo(TimeUnit.MILLISECONDS).build();
    reporter.start(1, TimeUnit.SECONDS);

     Counter c = metricRegistry.counter("foo"); //counter
     c.inc();
   
     Histogram h = metricRegistry.histogram("foo"); //distribution
     h.update(200);
   
     Meter m = metricRegistry.meter("foo"); //throughput
     m.mark();
     m.mark(200);
   
     Timer t = metricRegistry.timer("foo"); //times an event
     Timer.Context ctx = t.time();
     ctx.stop();


Typical ConsoleReporter output:


2/12/15 8:34:21 PM =============================================================

-- Counters --------------------------------------------------------------------
hlr.assetsOnDupeShards-Advisory
             count = 1
hlr.lastSyncScan
             count = 2

-- Histograms ------------------------------------------------------------------
hlr.shardAssetCount-shard1
             count = 1
               min = 10
               max = 10
              mean = 10.00
            stddev = 0.00
            median = 10.00
              75% <= 10.00
              95% <= 10.00
              98% <= 10.00
              99% <= 10.00
            99.9% <= 10.00
hlr.shardAssetCount-shard2
             count = 1
               min = 10
               max = 10
              mean = 10.00
            stddev = 0.00
            median = 10.00
              75% <= 10.00
              95% <= 10.00
              98% <= 10.00
              99% <= 10.00
            99.9% <= 10.00

-- Timers ----------------------------------------------------------------------
hlr.shardSyncDuration-shard1
             count = 1
         mean rate = 0.25 calls/second
     1-minute rate = 0.00 calls/second
     5-minute rate = 0.00 calls/second
    15-minute rate = 0.00 calls/second
               min = 100.32 milliseconds
               max = 100.32 milliseconds
              mean = 100.32 milliseconds
            stddev = 0.00 milliseconds
            median = 100.32 milliseconds
              75% <= 100.32 milliseconds
              95% <= 100.32 milliseconds
              98% <= 100.32 milliseconds
              99% <= 100.32 milliseconds
            99.9% <= 100.32 milliseconds
hlr.shardSyncDuration-shard2
             count = 1
         mean rate = 0.25 calls/second
     1-minute rate = 0.00 calls/second
     5-minute rate = 0.00 calls/second
    15-minute rate = 0.00 calls/second
               min = 100.67 milliseconds
               max = 100.67 milliseconds
              mean = 100.67 milliseconds
            stddev = 0.00 milliseconds
            median = 100.67 milliseconds
              75% <= 100.67 milliseconds
              95% <= 100.67 milliseconds
              98% <= 100.67 milliseconds
              99% <= 100.67 milliseconds
            99.9% <= 100.67 milliseconds