Issue #148: [Linux] Enhance filesystem utilization calculation

[NassimBtk]

This pull request includes an important update to the src/main/connector/system/Linux/Linux.yaml file, specifically within the monitors section. The change modifies the awk script used for processing disk usage information.

Key change:

• src/main/connector/system/Linux/Linux.yaml: Updated the awk script to correctly calculate the percentage of used and available space by using the sum of used and available space as the denominator.

Testing:

root@nb-debian:/opt/workspace/opentelemetry-collector-contrib# /usr/bin/df -B1
Filesystem       1B-blocks        Used  Available Use% Mounted on
udev            2053718016           0 2053718016   0% /dev
tmpfs            413818880    41848832  371970048  11% /run
/dev/sda1      42091429888 32452136960 7574675456  82% /
tmpfs           2069078016           0 2069078016   0% /dev/shm
tmpfs              5242880           0    5242880   0% /run/lock
tmpfs           2069078016           0 2069078016   0% /sys/fs/cgroup
tmpfs            413814784           0  413814784   0% /run/user/0

[bertysentry]

I wonder whether we should update the system dashboards in Grafana. But this is good! 😅

Nothing like real life testing... 😉

[NassimBtk]

System dashboards updates: sentrysoftware/grafana-dashboards#26.