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Last updated: July 2026. Your AI feature works in development. It demos well. Then it hits production and you discover three problems your test suite did not catch: the LLM hallucinates product names that do not exist, the RAG retrieval step adds 4 seconds to every request, and your OpenAI bill is 3x what you budgeted because one prompt template is burning tokens on context that does not help the output. Traditional APM would have caught the latency.

Your Node.js app is slow and you are not sure where. The response time dashboard shows spikes but not causes. The logs say nothing useful. CPU looks fine. Memory looks fine. Users are complaining anyway. This is the standard Node.js performance debugging experience. The single-threaded event loop, async-everything execution model, and connection pool sharing across all requests make Node.js performance problems different from what you see in Ruby or Python.

Last updated: July 2026. Pricing verified against public vendor pricing pages on July 9, 2026. The monitoring tool market in 2026 is split. On one side, enterprise platforms keep adding features: security scanning, network monitoring, CI/CD integration, cost management. On the other, developer-focused tools are going deeper on what matters during a production incident: how fast you get from alert to the line of code that caused the problem.

Last updated: July 2026 Your Rails app throws a 500. You open Sentry and find the exception. The stack trace points to a controller action, but it does not tell you why the database call failed. You switch to Datadog and search for the request trace. The trace shows a 3-second query, but you do not know what the application was logging at that moment. You open your log aggregator, paste in the request ID, and scroll through output until you find the slow query log line that explains the lock contention.