I am not sure of any project integrated with NewRelic, however you can congiure it to monitor your appication instance.
In New Relic APM there is an Availability Monitoring option. this allows you to configure a URL that we ping to check it responds with a 200 OK response. This can be set once per application in APM.
If you have multiple URLs you need to monitor, the better product to configure is New Relic Synthetics Ping. This will allow you to monitor a URL and define the locations that monitor the url and how often it is checked.
You can provide pingservice URL to monitor Pega platform instance.
Pingservice URL - http://<<hostName:port/contextName>>/PRRestService/monitor/pingservice/ping