à compléter

D'après les articles suivants, il problème viendrait de la configuration de la rétention ou de la fréquence à laquelle Centreon envoie les données à Graphite.
https://www.sugarbug.fr/atelier/maquettes/centreon_graphite_graphana/configuration/
https://serverfault.com/questions/593157/graphite-shows-none-for-all-data-points-even-though-i-send-it-data
https://theholyjava.wordpress.com/2014/05/05/graphite-shows-metrics-but-no-data-troubleshooting/

[root@inf5ssupt708 whisper]# whisper-info /var/lib/carbon/whisper/centreon/metrics/yot5sutia601_admin_pilote_justice_local/Cpu/cpu_0.wsp 
maxRetention: 86400
xFilesFactor: 0.5
aggregationMethod: average
fileSize: 17308

Archive 0
retention: 86400
secondsPerPoint: 60
points: 1440
size: 17280
offset: 28
[root@inf5ssupt708 whisper]# 

whisper-fetch --pretty /var/lib/carbon/whisper/centreon/metrics/yot5sutia601_admin_pilote_justice_local/Cpu/cpu_0.wsp 
Mon Apr  6 17:43:00 2020	None
Mon Apr  6 17:44:00 2020	None
Mon Apr  6 17:45:00 2020	None
Mon Apr  6 17:46:00 2020	None
Mon Apr  6 17:47:00 2020	None
Mon Apr  6 17:48:00 2020	None
Mon Apr  6 17:49:00 2020	None
Mon Apr  6 17:50:00 2020	None
Mon Apr  6 17:51:00 2020	None
Mon Apr  6 17:52:00 2020	None
Mon Apr  6 17:53:00 2020	None
Mon Apr  6 17:54:00 2020	None
Mon Apr  6 17:55:00 2020	None
Mon Apr  6 17:56:00 2020	None
Mon Apr  6 17:57:00 2020	None
Mon Apr  6 17:58:00 2020	None
Mon Apr  6 17:59:00 2020	None
Mon Apr  6 18:00:00 2020	None
Mon Apr  6 18:01:00 2020	None
Mon Apr  6 18:02:00 2020	None
Mon Apr  6 18:03:00 2020	None
Mon Apr  6 18:04:00 2020	None
Mon Apr  6 18:05:00 2020	None
Mon Apr  6 18:06:00 2020	None

2020-04-27 : J'ai ajusté la rétention (fichier /etc/carbon/storage-schemas.conf) en reprenant les paramètres du serveur de prod snc1ssupt002.

# edit 20200427 by d.loussouarn according to prod server snc1ssupt002 parameters
#[default_1min_for_1day]
#pattern = .*
#retentions = 60s:1d

# edit 20200427 by d.loussouarn according to prod server snc1ssupt002 parameters
[default_5min_for_30days_and archive]
pattern = .*
retentions = 300s:30d,30m:1y