Right way to add many facts based on hostname condition - puppet

Question

I need to insert multiple facts on many machines(100+) based on its hostname. All the machines get a single app deployed but the app configuration differs and also machines form part of different clusters. I am trying to find the right approach to implement this. One approach I found in How can I create a custom :host_role fact from the hostname? wherein there is a condition in facter add code block to check for hostname.
I was also thinking if there is a way to add multiple facts in one facter add call instead of having 1 per facter as that way I can logically organize my code on cluster/machines instead of facts.
Example:
Machine1 and its facts:
clustername: C1
Java version: 1.8.60
ProcessRuns: 3
Machine2 and its facts:
clustername: C1
Java version: 1.8.60
ProcessRuns: 1
Machine3 and its facts:
clustername: C2
Java version: 1.9.00
ProcessRuns: 1
Machine4 and its facts:
clustername: C2
Java version: 1.9.00
ProcessRuns: 2
Machine5 and its facts:
clustername: C3
Java version: 1.9.60
ProcessRuns: 1

Answer 1

I did not find any way to have multiple facts in 1 facter.add call so went with 1 call per fact I wanted to add.
The fact file finally looks something like this:
when "Machine1"
Facter.add(:processcount) do
setcode do
3
end
end
when "Machine2", "Machine3", "Machine5"
Facter.add(:processcount) do
setcode do
1
end
end