Thank you for your time, I think I finally fixed it. This is how:
First time I've installed XO from this guide: https://github.com/ronivay/XenOrchestraInstallerUpdater
I used Appliance version - prebuilt VM with XO installed. And there was a problem with negative values.
Now I've tried this guide: https://github.com/Jarli01/xenorchestra_updater
And instead of using prebuilt VM version, I ran Installation script on previously created Debian 10 VM. After script finish installing XO and all necessary libraries/dependencies, I've all telemetry working properly.