Zooming onto “oplog callback errors” - this happens and as soon as this is logged, nodejs process exits. Supervisor brings it up - in the meantime, the users connected to this server receives 5XX errors.
Error in oplog callback TypeError: Cannot read property 'u' of undefined
at ModelsBaseDb.RocketChat.models.Subscriptions.on
(/home/deploy/channels/releases/20181029033207/bundle/programs/server/app/app.js:12817:58)
at emitOne (events.js:116:13)
at ModelsBaseDb.emit (events.js:211:7)
at ModelsBaseDb.processOplogRecord (/home/deploy/channels/releases/20181029033207/bundle/programs/server/packages/rocketchat_lib.js:11699:12) at /home/deploy/channels/releases/20181029033207/bundle/programs/server/packages/mongo.js:1494:7
at runWithEnvironment (packages/meteor.js:1238:24)
at Object.callback (packages/meteor.js:1251:14)
at /home/deploy/channels/releases/20181029033207/bundle/programs/server/packages/ddp-server.js:2130:36
at Array.forEach (<anonymous>:null:null)
at Function._.each._.forEach (packages/underscore.js:139:11)
at DDPServer._Crossbar.fire (/home/deploy/channels/releases/20181029033207/bundle/programs/server/packages/ddp-server.js:2128:7)
at /home/deploy/channels/releases/20181029033207/bundle/programs/server/packages/mongo.js:1719:26
at Meteor.EnvironmentVariable.EVp.withValue (packages/meteor.js:1186:12)
at packages/meteor.js:502:25
at runWithEnvironment (packages/meteor.js:1238:24)