FastAPI Monitoring with TraceKit
FastAPI is built for speed -- but async dependency injection chains are invisible by default, Pydantic serialization costs hide in every response, and BackgroundTasks lose trace context entirely. TraceKit makes every async hop visible.
Why FastAPI Needs Better Observability
Common debugging challenges that traditional monitoring tools miss.
Async Dependency Injection Tracing
FastAPI's Depends() system is powerful but opaque. A single endpoint can trigger a tree of async dependencies -- auth, database sessions, feature flags -- and you cannot see which dependency is slow or failing. TraceKit traces every Depends() resolution so the full injection chain appears in your trace.
Pydantic Validation Overhead
Every FastAPI request and response passes through Pydantic serialization. With nested models and large payloads, validation and serialization can consume significant time that is invisible in standard profiling. TraceKit measures Pydantic processing time per endpoint so you can spot serialization bottlenecks.
Background Task Context Loss
FastAPI's BackgroundTasks run after the response is sent, but they lose the original request's trace context. A task that writes to a database or calls an external API appears as an orphan trace. TraceKit propagates context into background tasks so they stay connected to the originating request.
Get Started in Minutes
Add TraceKit to your FastAPI project with a few lines of code.
from opentelemetry.instrumentation.fastapi import FastAPIInstrumentor
from fastapi import FastAPI
app = FastAPI()
FastAPIInstrumentor.instrument_app(app)
@app.get("/items/{item_id}")
async def read_item(item_id: int):
return {"item_id": item_id}What You Get with TraceKit
Everything you need to monitor FastAPI in production.
Distributed Tracing
Trace requests across FastAPI endpoints, async dependencies, Pydantic validation, and background tasks. See the full async request lifecycle from ingress to response.
Live Code Monitoring
Set breakpoints in your FastAPI route handlers and dependency functions. Inspect Pydantic models, request state, and async context in production without redeploying.
Simple Pricing
$29/month flat for your entire FastAPI application. No per-worker fees for Uvicorn, no per-request charges -- one price for full async observability.
Related Resources
Docs, guides, and tools to help you get the most out of TraceKit.
Ready to debug FastAPI in production?
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