Clarification about opentelemetry metrics

[RuslanGorbaty]

I'm using atm opentelemetry-demo for my otel configurations, and there is an issue with hostmetrics. There are a default hostmetrics as they appear in documentation: system_memory_usage_By , system_disk_io_By_total , system_network_io_By_total with particular labels,
But there are additional metrics that appear as host metrics with different endings:
system_memory_usage_bytes , system_disk_io_bytes_total , system_network_io_bytes_total that have additional labels for example k8s_deployment_name, k8s_namespace_name, k8s_daemonset_name etc...),
and it seems that those metrics (the bytes ones) are coming only from recommendationservice.

How does the recommendationservice generate those metrics? And how does he apply extra labels
? Is it possible to add those labels to default hostmetrics as well, if yes how?