Divide by zero error in JVM metrics sampler

[emlyn]

I got a divide by zero error from the JVM metrics sampler when running low on memory.
Here's a stack trace (from version 0.5.0):

 [[clojure.lang.Numbers divide "Numbers.java" 188]
  [clojure.lang.Numbers divide "Numbers.java" 3901]
  [com.brunobonacci.mulog.publishers.jvm_metrics$capture_memory_pools$iter__263__267$fn__268$fn__269 invoke "jvm_metrics.clj" 144]
  [com.brunobonacci.mulog.publishers.jvm_metrics$capture_memory_pools$iter__263__267$fn__268 invoke "jvm_metrics.clj" 139]
  [clojure.lang.LazySeq sval "LazySeq.java" 42]
  [clojure.lang.LazySeq seq "LazySeq.java" 51]
  [clojure.lang.RT seq "RT.java" 535]
  [clojure.core$seq__5402 invokeStatic "core.clj" 137]
  [clojure.core.protocols$seq_reduce invokeStatic "protocols.clj" 24]
  [clojure.core.protocols$fn__8146 invokeStatic "protocols.clj" 75]
  [clojure.core.protocols$fn__8146 invoke "protocols.clj" 75]
  [clojure.core.protocols$fn__8088$G__8083__8101 invoke "protocols.clj" 13]
  [clojure.core$reduce invokeStatic "core.clj" 6828]
  [clojure.core$into invokeStatic "core.clj" 6895]
  [clojure.core$into invoke "core.clj" 6887]
  [com.brunobonacci.mulog.publishers.jvm_metrics$capture_memory_pools invokeStatic "jvm_metrics.clj" 138]
  [com.brunobonacci.mulog.publishers.jvm_metrics$capture_memory_pools invoke "jvm_metrics.clj" 137]
  [com.brunobonacci.mulog.publishers.jvm_metrics$jvm_sample_memory invokeStatic "jvm_metrics.clj" 257]
  [com.brunobonacci.mulog.publishers.jvm_metrics$jvm_sample_memory invoke "jvm_metrics.clj" 249]
  [com.brunobonacci.mulog.publishers.jvm_metrics$jvm_sample_memory invokeStatic "jvm_metrics.clj" 252]
  [com.brunobonacci.mulog.publishers.jvm_metrics$jvm_sample_memory invoke "jvm_metrics.clj" 249]
  [com.brunobonacci.mulog.publishers.jvm_metrics$jvm_sample invokeStatic "jvm_metrics.clj" 310]
  [com.brunobonacci.mulog.publishers.jvm_metrics$jvm_sample invoke "jvm_metrics.clj" 286]
  [com.brunobonacci.mulog.publishers.jvm_metrics.JvmMetricsPublisher publish "jvm_metrics.clj" 336]
  [com.brunobonacci.mulog.core$start_publisher_BANG_$publish_attempt__6733 invoke "core.clj" 190]
  [clojure.core$binding_conveyor_fn$fn__5754 invoke "core.clj" 2033]
  [clojure.lang.AFn applyToHelper "AFn.java" 154]
  [clojure.lang.RestFn applyTo "RestFn.java" 132]
  [clojure.lang.Agent$Action doRun "Agent.java" 114]
  [clojure.lang.Agent$Action run "Agent.java" 163]
  [java.util.concurrent.ThreadPoolExecutor runWorker "ThreadPoolExecutor.java" 1149]
  [java.util.concurrent.ThreadPoolExecutor$Worker run "ThreadPoolExecutor.java" 624]
  [java.lang.Thread run "Thread.java" 748]]},

It might be an idea to check for a zero denominator in capture-memory-pools and handle it gracefully.

[BrunoBonacci]

released in v0.6.4