There are no apps that can do everything, there are different use cases that require at least 3 different tools to cover logs, system metrics, application metri

There are no apps that can do everything, there are different use cases that require at least 3 different tools to cover logs, system metrics, application metrics, alerts and performance instrumentation. If you've never worked in that domain, you can trial the tool and figure out what they're about. Short version is to go for ELK + Datadog + NewRelic.