There is possible memory leak

[Gormartsen]

{ '$set': { metrics: [ [Object], [Object] ], changed: 1485460010457 } }

<--- Last few GCs --->

[24707:0x2ccbfd0]   917290 ms: Scavenge 15.9 (22.0) -> 15.2 (22.0) MB, 1.7 / 0.0 ms  allocation failure
[24707:0x2ccbfd0]   946357 ms: Scavenge 16.0 (22.0) -> 15.4 (22.0) MB, 2.3 / 0.0 ms  allocation failure
[24707:0x2ccbfd0]   947161 ms: Mark-sweep 15.6 (22.0) -> 13.1 (22.0) MB, 21.5 / 0.0 ms  allocation failure GC in old space requested
[24707:0x2ccbfd0]   947194 ms: Scavenge 23.2 (31.2) -> 23.2 (32.2) MB, 1.8 / 0.0 ms  (+ 11.9 ms in 15 steps since last GC) allocation failure


<--- JS stacktrace --->
Cannot get stack trace in GC.
FATAL ERROR: Scavenger: promoting marked
 Allocation failed - process out of memory
 1: node::Abort() [/usr/bin/node]
 2: 0x11d121c [/usr/bin/node]
 3: v8::Utils::ReportOOMFailure(char const*, bool) [/usr/bin/node]
 4: v8::internal::V8::FatalProcessOutOfMemory(char const*, bool) [/usr/bin/node]
 5: 0xa3743b [/usr/bin/node]
 6: void v8::internal::ScavengingVisitor<(v8::internal::MarksHandling)0, (v8::internal::PromotionMode)0, (v8::internal::LoggingAndProfiling)1>::EvacuateObject<(v8::internal::ScavengingVisitor<(v8::internal::MarksHandling)0, (v8
::internal::PromotionMode)0, (v8::internal::LoggingAndProfiling)1>::ObjectContents)0, (v8::internal::AllocationAlignment)0>(v8::internal::Map*, v8::internal::HeapObject**, v8::internal::HeapObject*, int) [/usr/bin/node]
 7: v8::internal::ScavengeVisitor::VisitPointers(v8::internal::Object**, v8::internal::Object**) [/usr/bin/node]
 8: v8::internal::HandleScopeImplementer::IterateThis(v8::internal::ObjectVisitor*) [/usr/bin/node]
 9: v8::internal::Heap::IterateStrongRoots(v8::internal::ObjectVisitor*, v8::internal::VisitMode) [/usr/bin/node]
10: v8::internal::Heap::IterateRoots(v8::internal::ObjectVisitor*, v8::internal::VisitMode) [/usr/bin/node]
11: v8::internal::Heap::Scavenge() [/usr/bin/node]
12: v8::internal::Heap::PerformGarbageCollection(v8::internal::GarbageCollector, v8::GCCallbackFlags) [/usr/bin/node]
13: v8::internal::Heap::CollectGarbage(v8::internal::GarbageCollector, char const*, char const*, v8::GCCallbackFlags) [/usr/bin/node]
14: v8::internal::Factory::NewRawTwoByteString(int, v8::internal::PretenureFlag) [/usr/bin/node]
15: v8::internal::IncrementalStringBuilder::Extend() [/usr/bin/node]
16: v8::internal::JsonStringifier::SerializeString(v8::internal::Handle<v8::internal::String>) [/usr/bin/node]
17: v8::internal::JsonStringifier::SerializeString(v8::internal::Handle<v8::internal::String>) [/usr/bin/node]
18: v8::internal::JsonStringifier::Result v8::internal::JsonStringifier::Serialize_<true>(v8::internal::Handle<v8::internal::Object>, bool, v8::internal::Handle<v8::internal::Object>) [/usr/bin/node]
19: v8::internal::JsonStringifier::Result v8::internal::JsonStringifier::Serialize_<false>(v8::internal::Handle<v8::internal::Object>, bool, v8::internal::Handle<v8::internal::Object>) [/usr/bin/node]
20: v8::internal::JsonStringifier::Stringify(v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>, v8::internal::Handle<v8::internal::Object>) [/usr/bin/node]
21: 0xaf64f5 [/usr/bin/node]
22: v8::internal::Builtin_JsonStringify(int, v8::internal::Object**, v8::internal::Isolate*) [/usr/bin/node]
23: 0x1611dfc06167
Thu, 26 Jan 2017 19:46:51 GMT cluster:main Worker 24707 died. code null signal SIGABRT
Thu, 26 Jan 2017 19:46:51 GMT cluster:main Starting a new worker
Thu, 26 Jan 2017 19:46:51 GMT cluster:main Worker 26934 is online