What tools for Application Performance Monitoring do you know and have used in practice?

For application performance monitoring (APM) in Python, the following tools are often used:

• New Relic: a powerful cloud service for application monitoring, supports Python, allows tracking response times, errors, and load.
• Datadog APM: integrates with Python applications, collects metrics, traces, and logs.
• Elastic APM: part of Elastic Stack, allows collecting and visualizing performance data.
• Prometheus + Grafana: although primarily a monitoring and visualization system, exporters can be used to collect metrics from Python applications.
• Sentry Performance Monitoring: besides error tracking, supports performance monitoring.

In practice, APM is often combined with logging and metrics for comprehensive analysis. For example, in one project, I used New Relic to monitor response times of a web service and identify bottlenecks in the database.