experimental_metricsgeneration divide calculation is not correct

[gaussye]

Component(s)

No response

What happened?

Description

I using experimental_metricsgeneration to get the utilization if volume by using divide function.
Configure:
experimental_metricsgeneration:
rules:
- name: pvc.utilization
type: calculate
metric1: kubelet_volume_stats_used_bytes
metric2: kubelet_volume_stats_capacity_bytes
operation: divide
- name: pvc.utilization.percentage
type: calculate
metric1: kubelet_volume_stats_used_bytes
metric2: kubelet_volume_stats_capacity_bytes
operation: percent

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Below are the metrics:

kubelet_volume_stats_available_bytes	33057693696
kubelet_volume_stats_capacity_bytes	33501757440
kubelet_volume_stats_inodes	2097152
kubelet_volume_stats_inodes_free	2097075
kubelet_volume_stats_inodes_used	77
kubelet_volume_stats_used_bytes	427286528
namespace	kubecost
net.host.name	ip-10-0-23-147.eu-west-1.compute.internal
persistentvolumeclaim	cost-analyzer-prometheus-server
pvc.utilization	0.10311770985726147
pvc.utilization.percentage	10.311770985726147

Steps to Reproduce

Expected Result

pvc.utilization = kubelet_volume_stats_used_bytes/kubelet_volume_stats_capacity_bytes=427286528/33501757440=0.01275

Actual Result

pvc.utilization = 0.10311770985726147

Collector version

0.38.1

Environment information

Environment

OS: (e.g., "Ubuntu 20.04")
Compiler(if manually compiled): (e.g., "go 14.2")

OpenTelemetry Collector configuration

No response

Log output

No response

Additional context

No response

[github-actions]

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