Scout

https://scoutapp.com

Fort Collins, CO, USA

2008

FastAPI 0.142 Turns On OpenTelemetry by Default. Here's What It Records.

Oct 5, 2026 | By Scout APM

FastAPI 0.142.0 ships with OpenTelemetry built in. Install fastapi, set one environment variable, and every request produces a trace, metrics, and error logs. No middleware, no instrumentation package, no code. That’s a big change for a framework most Python teams instrument by hand. It’s also easy to misread. The defaults record more than some teams expect in one place, and less than others assume in another. Here’s what you actually get.

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Best Monitoring Tools With MCP Servers for AI Coding Agents (2026)

Oct 1, 2026 | By Scout APM

Your AI coding agent can read your code, run your tests, and open a pull request. Until recently it could not see what that code does in production. MCP servers from monitoring vendors close that gap. Connect one, and Claude Code, Cursor, or Copilot can pull the error, the trace, and the slow query behind a bug report without you copying anything out of a dashboard. Most major monitoring vendors now offer an official MCP server. But they aren’t interchangeable. Some only expose errors.

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Every 404 in Your Rails App Might Be Allocating 13 MB

Sep 30, 2026 | By Scout APM

A bot requests /wp-login.php on your Rails app. Rails can’t route it, raises ActionController::RoutingError, and returns a 404. That should cost almost nothing. On a Rails 8.1 app with a few thousand compiled templates, it can cost 13 MB of allocations and 27 ms of CPU. A detailed report on rails/rails#58887 traces the cost to one method, ActionDispatch::ExceptionWrapper#build_backtrace.

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Starlette 1.7.0 Brings Native Tracing and Smarter Route Naming

Sep 29, 2026 | By Mitchell Hartweg

If you’re running FastAPI, you’re running Starlette underneath it, whether you think about it or not. At Scout, we spend a lot of time thinking about what happens at that ASGI layer, since that’s exactly where our Python agent hooks in to give you request-level visibility. Starlette 1.7.0 just landed, and it’s a release worth reading closely if you care about tracing, routing, or just keeping your app running on a supported dependency chain.

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Mongoid 7.6.2 Patches Four Real Security Gaps, Not Just Bugs

Sep 23, 2026 | By Mitchell Hartweg

A patch release that never says the word “security” just closed four real security gaps in Mongoid. If your Rails app runs on MongoDB, 7.6.2 is the kind of release that’s easy to auto-merge and easy to regret not reading first.

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OpenAI Python SDK 3.17.0: a Breaking Change and Six New Features

Sep 22, 2026 | By Scout APM

If your app pins openai in requirements or a lockfile, read this before you bump the version, not after something breaks.

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Anomaly Detection Is Now Generally Available

Sep 16, 2026 | By Aspen Clevenger

You set a threshold alert on a checkout endpoint at 500ms. It pages you every Monday at 9am, when traffic doubles and nothing is actually wrong. You raise the threshold to 800ms to make the noise stop. Three weeks later a real regression creeps in at 650ms, and nobody gets paged, because you tuned the alert to survive Mondays instead of to catch problems.

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Prompts, skills, and the AGENTS.md nobody wants to write (and how Anthropic writes theirs)

Sep 4, 2026 | By Jack Rothrock

You’ve watched Claude Code compact a conversation. The context bar fills, it pauses, a summary appears, and it carries on like nothing happened. You probably assumed a housekeeping script trimmed the transcript in the background. It didn’t. The model compacted itself. When the window fills, Claude Code sends a long, specific prompt telling the model how to summarize its own conversation. Then it does, same model, same turn. The thing managing your context window is just another instruction.

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Can we live dangerously? Sandboxing Claude, and the Claude foreman that runs the rest

Sep 4, 2026 | By Jack Rothrock

While logging into one’s LinkedIn will spew out endless talk of AI possibilities from “thought leaders” and the semi-disconnected alike, another pocket of the world spent the last few weeks watching the Shai-Hulud worm chew through npm. A self-propagating credential stealer that hit 400-plus packages and, delightfully, planted Claude Code and VS Code hooks so just opening the repo could run its payload.

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NestJS v12 Ships Native Observability: What It Means for Your APM

Aug 31, 2026 | By Sarah Morgan

NestJS 12 dropped last week with ESM packages, Standard Schema validation, a rebuilt CLI, and a brand-new observability SDK. That last one is the most interesting part for anyone running NestJS in production with an APM tool. At Scout Monitoring, we instrument NestJS applications through our Node.js agent. A framework shipping its own observability layer changes the conversation for every APM vendor in the ecosystem, including us. Here is what you need to know.

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