feat: enhance the demo with disk telemetries

[Kevin222004]

Part of #5

I have added the disk telemetry. https://github.com/influxdata/telegraf/tree/master/plugins/inputs/disk

Testing data that it works

$ cd config                                                                           
               
 [~/Desktop/opi/otel/config]
$ telegraf --config telegraf.conf > telegraph.txt 
                            
                            
 [~/Desktop/opi/otel/config]
 $ cat telegraph.txt | grep disk
disk,device=nvme0n1p2,fstype=ext4,host=kevin-Inspiron-15-5510,mode=rw,path=/ inodes_free=27164985i,inodes_used=4030151i,inodes_used_percent=12.919164705677193,total=501809635328i,free=235259224064i,used=240984608768i,used_percent=50.60109804151729,inodes_total=31195136i 1719322320000000000
disk,device=efivarfs,fstype=efivarfs,host=kevin-Inspiron-15-5510,mode=rw,path=/sys/firmware/efi/efivars used_percent=69.72437234617055,inodes_total=0i,inodes_free=0i,inodes_used=0i,inodes_used_percent=0,total=382876i,free=114368i,used=263388i 1719322320000000000
disk,device=nvme0n1p1,fstype=vfat,host=kevin-Inspiron-15-5510,mode=rw,path=/boot/efi inodes_total=0i,inodes_free=0i,inodes_used=0i,inodes_used_percent=0,total=1124999168i,free=1060528128i,used=64471040i,used_percent=5.730763349328984 1719322320000000000
disk,device=nvme0n1p2,fstype=ext4,host=kevin-Inspiron-15-5510,mode=rw,path=/ free=235259174912i,used=240984657920i,used_percent=50.601108362280854,inodes_total=31195136i,inodes_free=27164985i,inodes_used=4030151i,inodes_used_percent=12.919164705677193,total=501809635328i 1719322330000000000
disk,device=efivarfs,fstype=efivarfs,host=kevin-Inspiron-15-5510,mode=rw,path=/sys/firmware/efi/efivars inodes_used_percent=0,total=382876i,free=114368i,used=263388i,used_percent=69.72437234617055,inodes_total=0i,inodes_free=0i,inodes_used=0i 1719322330000000000
disk,device=nvme0n1p1,fstype=vfat,host=kevin-Inspiron-15-5510,mode=rw,path=/boot/efi free=1060528128i,used=64471040i,used_percent=5.730763349328984,inodes_total=0i,inodes_free=0i,inodes_used=0i,inodes_used_percent=0,total=1124999168i 1719322330000000000
disk,device=nvme0n1p2,fstype=ext4,host=kevin-Inspiron-15-5510,mode=rw,path=/ inodes_free=27164985i,inodes_used=4030151i,inodes_used_percent=12.919164705677193,total=501809635328i,free=235259154432i,used=240984678400i,used_percent=50.601112662599014,inodes_total=31195136i 1719322340000000000
disk,device=efivarfs,fstype=efivarfs,host=kevin-Inspiron-15-5510,mode=rw,path=/sys/firmware/efi/efivars used=263388i,used_percent=69.72437234617055,inodes_total=0i,inodes_free=0i,inodes_used=0i,inodes_used_percent=0,total=382876i,free=114368i 1719322340000000000
disk,device=nvme0n1p1,fstype=vfat,host=kevin-Inspiron-15-5510,mode=rw,path=/boot/efi used=64471040i,used_percent=5.730763349328984,inodes_total=0i,inodes_free=0i,inodes_used=0i,inodes_used_percent=0,total=1124999168i,free=1060528128i 1719322340000000000

[glimchb]

thanks @Kevin222004 for the contribution

please fix https://commitlint.js.org/ checker failing

please also add curl call here to test we actually getting correct metrics :

otel/.github/workflows/docker-publish.yml

Line 49 in f161093

curl --fail http://127.0.0.1:9091/api/v1/query?query=nginx_requests | grep nginx_requests

and also same here, just for documentation:

otel/README.md

Line 115 in f161093

curl --fail http://127.0.0.1:9091/api/v1/query?query=nginx_requests | grep nginx_requests

also when runnign in docker, we need to document for this specific disc plugin we need to fix hostfs like this
and fix compose

otel/docker-compose.yml

Lines 43 to 44 in f161093

	volumes:
	- ./config/telegraf.conf:/etc/telegraf/telegraf.conf:ro

, for example:

  telegraf:
    image: docker.io/library/telegraf:1.29
    volumes:
      - /:/hostfs:ro
      - ./config/telegraf.conf:/etc/telegraf/telegraf.conf:ro
    environment:
      HOST_MOUNT_PREFIX: /hostfs
      HOST_PROC: /hostfs/proc

[glimchb]

see above

[Kevin222004]

@glimchb Thanks for reviewing.

I have updated the readme, added curl command for testing and added volume and env in docker-compose.

[glimchb]

from CI i see:

+ curl --fail 'http://127.0.0.1:9091/api/v1/query?query=disk_used_percent'
+ grep disk_used_percent
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100  1069  100  1069    0     0   927k      0 --:--:-- --:--:-- --:--:-- 1043k
{"status":"success","data":{"resultType":"vector","result":[{"metric":{"__name__":"disk_used_percent","device":"nsfs","fstype":"nsfs","host":"36a8694974a0","instance":"otel-gw-collector:8889","job":"otel-collector","label1":"value1","mode":"rw","path":"/run/snapd/ns/lxd.mnt"},"value":[1719420750.837,"0.054752331251604065"]},{"metric":{"__name__":"disk_used_percent","device":"sda1","fstype":"ext4","host":"36a8694974a0","instance":"otel-gw-collector:8889","job":"otel-collector","label1":"value1","mode":"rw","path":"/"},"value":[1719420750.837,"74.89278022464133"]},{"metric":{"__name__":"disk_used_percent","device":"sda15","fstype":"vfat","host":"36a8694974a0","instance":"otel-gw-collector:8889","job":"otel-collector","label1":"value1","mode":"rw","path":"/boot/efi"},"value":[1719420750.837,"5.789958954053813"]},{"metric":{"__name__":"disk_used_percent","device":"sdb1","fstype":"ext4","host":"36a8694974a0","instance":"otel-gw-collector:8889","job":"otel-collector","label1":"value1","mode":"rw","path":"/mnt"},"

looks good