Memory leak

Description:

I see memory leak on the latest rocket chat version 0.74.3
How can i debug the root cause of the issue ?

Expected behavior:

No memory leak :)

Actual behavior:

Server Setup Information:

• Version of Rocket.Chat Server: 0.74.3
• Operating System: Ubuntu 18.04.1
• Deployment Method: docker
• Number of Running Instances: 1
• DB Replicaset Oplog: Disabled
• NodeJS Version: v8.11.4
• MongoDB Version: v4.0.5

Relevant logs:

I see some strange errors, that can be related to the issue:

[34mI20190302-14:54:21.610(0) Exception in onLogin callback: TypeError: Cannot redefine property: loginAt
at Function.defineProperty (<anonymous>)
at Object.keys.forEach.p (packages/rocketchat:statistics/server/lib/SAUMonitor.js:279:12)
at Array.forEach (<anonymous>)
at SAUMonitorClass._updateConnectionInfo (packages/rocketchat:statistics/server/lib/SAUMonitor.js:278:22)
at Accounts.onLogin.info (packages/rocketchat:statistics/server/lib/SAUMonitor.js:120:9)
at packages/callback-hook/hook.js:130:22
at _onLoginHook.each.callback (packages/accounts-base/accounts_server.js:178:7)
at Hook.each (packages/callback-hook/hook.js:108:15)
at AccountsServer._successfulLogin (packages/accounts-base/accounts_server.js:177:23)
at AccountsServer._attemptLogin (packages/accounts-base/accounts_server.js:350:12)
at MethodInvocation.methods.login (packages/accounts-base/accounts_server.js:520:23)
at MethodInvocation.methodMap.(anonymous function) (packages/rocketchat_monitoring.js:2731:30)
at maybeAuditArgumentChecks (packages/ddp-server/livedata_server.js:1767:12)
at DDP._CurrentMethodInvocation.withValue (packages/ddp-server/livedata_server.js:719:19)
at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1304:12)
at DDPServer._CurrentWriteFence.withValue (packages/ddp-server/livedata_server.js:717:46)
at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1304:12)
at Promise (packages/ddp-server/livedata_server.js:715:46)
at new Promise (<anonymous>)
at Session.method (packages/ddp-server/livedata_server.js:689:23)
at packages/ddp-server/livedata_server.js:559:43 

DDP RATE LIMIT: limit by connectionId per method
{
  "allowed": false,
  "timeToReset": 644,
  "numInvocationsLeft": 0,
  "userId": "oetxdmjGiBewXf34T",
  "clientAddress": "172.20.0.2",
  "type": "method",
  "name": "stream-notify-room",
  "connectionId": "rpkiRALqTkoMpSwjz",
  "broadcastAuth": false
}

Full logs:
Logs from the server interface:
server-rocket.log

Logs from docker container:
docker-rocket.log

Start with the stack trace in packages/rocketchat:statistics/server/lib/SAUMonitor.js, especially _updateConnectionInfo, and review the attached server and Docker logs. Reproduce the memory growth on the listed Rocket.Chat, NodeJS, MongoDB, Ubuntu, and Docker setup, then identify the cause and verify that the leak and related login errors are resolved.