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New Relic is a tool used to give deep performance analytics for every part of your platform: applications and servers. You can easily view and analyse massive amounts of data, and gain actionable insights in real-time. It's a major tool to use in case of an incident.
1 Setting up New Relic for
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Maestrano
See: Setup New Relic for Monitoring
2 Applications / APM
To know more about APMs, see 2 see: Application Performance Monitoring (APM)
Important KPIs to follow on an APM:
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To know more about Synthetics, see: 4 Synthetics