Scout APM

Application performance monitoring platform built for development teams, delivering code-level visibility into response times, throughput, and bottlenecks. Traces transactions down to the exact line of code with author and deploy context, surfaces N+1 query problems, and captures SQL within traces for fast root-cause analysis.

Scout APM supports Ruby, Python, Elixir, Node.js, and PHP through language-specific agents. Stands out with timeline and summary trace views: timeline shows execution order; summary aggregates by expense to highlight hot paths. Integrates error monitoring and log management with performance context, and offers request queuing instrumentation. Agents for Rails, Django, Flask, Phoenix, Express, and similar frameworks ship via package managers with low overhead.

Core features:

• Transaction traces with line-of-code backtraces, GitHub integration for code context, and SQL query capture
• Automatic N+1 and slow query detection
• Endpoint and background job instrumentation across web requests and workers
• Error monitoring and log management correlated with APM data
• Multi-language agents for Ruby, Python, Elixir, Node.js, and PHP

Teams use Scout APM to track down slow endpoints and heavy methods without sampling. Backend and full-stack engineers rely on it to correlate deploys with regressions and to debug performance issues in production. The auto-instrumentation fits into CI and existing observability workflows.