You are right, the New Relic Servers is the best one to get information about Confluence's Health and availability. I don't know about your entire environment, but the New Relic Platform also seems interesting. However, it will be useful only if you use other things hosted on new relic, like database, reverse proxy, etc...
If you only have Confluence, the New Relic Servers will be enough for you.
I hope it helps.
All the best,
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