System Metrics instrumentation shows Exception messages

[codeboten]

Describe your environment
Running the latest version of opentelemetry.instrumentation.system_metrics using Python 3.8 on MacOS

Steps to reproduce
Run the following

from opentelemetry.instrumentation.system_metrics import SystemMetrics
SystemMetrics(ConsoleMetricsExporter(), interval=1)
input("...\n")

What is the expected behavior?
Metrics are output to the console

What is the actual behavior?
The following exceptions are logged:

Exception while executing observer callback: 'sdiskio' object has no attribute 'read_merged_count'.
Exception while executing observer callback: 'scputimes' object has no attribute 'irq'.
Exception while executing observer callback: 'scputimes' object has no attribute 'irq'.
Exception while executing observer callback: 'svmem' object has no attribute 'cached'.
Exception while executing observer callback: 'svmem' object has no attribute 'cached'.
Exception while executing observer callback: psutil.AccessDenied (pid=91018).