You can find here the list of common alerts triggered by NewRelic and how to resolve them. Looking at the server by itself is usually not enough to understand the root cause of the issue, so it needs to be correlated to other events on the application side.
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1 - Memory Alert
Here, we have an alert on Memory usage on one of our servers, this is a non-critical alert but we will make sure no action is needed.
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Everything looks fine, but to ensure business services are not impacted, we are going back to APM
All good.
2 - APDEX Alert
The APDEX score is based on the application response time, when the application performs slowly, an alert is raised.
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From there an investigation will have to be lead to find the root cause of the performance issue and address the underlying problem.
See https://maestrano.atlassian.net/wiki/x/gOTgBQ Application Performance Monitoring (APM)
3 - Error Rate
When an application throws too many errors, an alert is raised. Following the alert link gives information about the Error rate over the time period.
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