Memory leak in v3.28.0

Describe the bug

High memory usage in v3.28.0, up to a point where the Node processes become unresponsive. Restarting reproduces.
I just reverted to v3.27.0 and will observe charts for a few hours. I’ll report here

In the screenshot below (from Kibana APM app itself), elastic-apm-node upgrade was merged on Feb. 9th at 3am (Paris time).This process is automatic. The app was restarted the same day at around 1pm

To Reproduce

Steps to reproduce the behavior:

1. Upgrade a running application using elastic-apm-node v3.27.0 to v3.28.0

Expected behavior

Nothing special, APM keeps on collecting data as usual.

Environment (please complete the following information)

• OS: Ubuntu 18.04
• Node.js version: 16.13.0
• APM Server version: 7.13.3
• Agent version: 3.28.0

How are you starting the agent? (please tick one of the boxes)

• Calling agent.start() directly (e.g. require('elastic-apm-node').start(...))
• Requiring elastic-apm-node/start from within the source code
• Starting node with -r elastic-apm-node/start

Additional context

• Agent config options No options, we use all defaults
• package.json dependencies:

   "@aws-sdk/client-s3": "3.50.0",
   "@elastic/ecs-winston-format": "1.3.1",
   "@elastic/elasticsearch": "7.17.0",
   "@fortawesome/fontawesome-free": "6.0.0",
   "angular": "1.8.2",
   "angular-animate": "1.8.2",
   "angular-aria": "1.8.2",
   "angular-chart.js": "1.1.1",
   "angular-file-saver": "1.1.3",
   "angular-i18n": "1.8.2",
   "angular-material": "1.2.4",
   "angular-material-data-table": "0.10.10",
   "angular-messages": "1.8.2",
   "angular-sanitize": "1.8.2",
   "angular-translate": "2.19.0",
   "angular-translate-loader-static-files": "2.19.0",
   "angular-ui-router": "1.0.30",
   "angulartics": "1.6.0",
   "angulartics-google-analytics": "0.5.0",
   "axios": "0.25.0",
   "basic-auth": "2.0.1",
   "body-parser": "1.19.1",
   "bull": "4.5.1",
   "bunyan-winston-adapter": "0.2.0",
   "chart.js": "2.9.4",
   "chartjs-plugin-annotation": "0.5.7",
   "chartjs-plugin-datalabels": "1.0.0",
   "cheerio": "1.0.0-rc.10",
   "cls-hooked": "4.2.2",
   "connect-flash": "0.1.1",
   "connect-multiparty": "2.2.0",
   "connect-redis": "6.1.1",
   "d3plus": "1.9.8",
   "dpkg-compare-versions": "1.0.1",
   "elastic-apm-node": "3.28.0",
   "email-templates": "8.0.8",
   "express": "4.17.2",
   "express-session": "1.17.2",
   "file-saver": "2.0.5",
   "form-data": "4.0.0",
   "google-palette": "1.1.0",
   "he": "1.2.0",
   "i18n-2": "0.7.3",
   "ioredis": "4.28.5",
   "jquery": "3.6.0",
   "js-yaml": "4.1.0",
   "jsonwebtoken": "8.5.1",
   "jstransformer-less": "2.3.0",
   "less": "4.1.2",
   "lodash": "4.17.21",
   "marked": "4.0.12",
   "method-override": "3.0.0",
   "mjml": "4.12.0",
   "moment": "2.29.1",
   "moment-duration-format": "2.3.2",
   "moment-timezone": "0.5.34",
   "mysql2": "2.3.3",
   "ng-file-upload": "12.2.13",
   "node-jose": "2.1.0",
   "node-stream-zip": "1.15.0",
   "nodemailer-stub": "1.2.2",
   "oidc-provider": "7.10.6",
   "openid-client": "5.1.3",
   "otplib": "12.0.1",
   "passport": "0.5.2",
   "passport-http": "0.3.0",
   "passport-jwt": "4.0.0",
   "passport-local": "1.0.0",
   "pug": "3.0.2",
   "puppeteer-core": "5.2.1",
   "qrcode": "1.5.0",
   "sequelize": "6.16.1",
   "sequelize-temporal": "1.0.8",
   "sha512crypt-node": "1.0.1",
   "svg-captcha": "1.4.0",
   "swagger-ui-express": "4.3.0",
   "tempy": "1.0.1",
   "umzug": "3.0.0",
   "uuid": "8.3.2",
   "winston": "3.5.1",
   "xlsx": "0.18.0",
   "zabbix-promise": "2.0.2"

[ddolcimascolo]

@trentm I can confirm that v3.29.0 fixes it. Thx again

[trentm]

elastic-apm-node@3.29.0 has been published with what I understand to be a fix for this.