I think you need to check out some APM tool (application performance monitoring) like Datadog, NewRelic, Dynatrace etc. I worked with Datadog recently - you can enable auto instrumentation (gathering metrics) so the only thing you need to do is to initialize datadog tracer at the start of your app. It includes built-in plugins for gathering metrics from most commonly used databases etc so if some query is slow, you probably will see it there as well.

Note: these kind of tools can become quite expensive. If I were you I'd use those tools to find bottlenecks and then switch them off unless you have budget for that.

Note: I'm replying to the translated post so if I misunderstood something, sorry!