If you see that only half the graphs are working, this is probably due to one of two reasons:
- An instance has lost SNMP connectivity (devices appear to be down)
- An instance is unable to rsync updated RRD files to its partner instance.
Both depend on Puppet modules working accurately.
If you have SSH access to the Cacti server prod-cacti01-fra-de.geant.net, you can check the latter reason by looking to see if there are plenty of RRD files that are being updated in the last few minutes:
ssh -l <username> prod-cacti01-fra-de.geant.net
ls -lart /opt/cacti/rra | less
You will see many old obsolete files for Terminated services that haven't been updated recently but there should be a decent amount at the end of the list.