docs: Add FastAPI + Uvicorn monitoring example #1103
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- Demonstrate native ASGI integration - Include multiprocess guidance Signed-off-by: yuhao <yuhao541@qq.com>
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| app = FastAPI() | ||
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| Define metrics with multiprocess aggregation |
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| Define metrics with multiprocess aggregation | |
| # Define metrics with multiprocess aggregation |
| ) | ||
| return make_asgi_app(registry=registry) | ||
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| Mount endpoint with trailing slash |
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| Mount endpoint with trailing slash | |
| # Mount endpoint with trailing slash |
| "http_requests_total", | ||
| "Total HTTP requests by endpoint", | ||
| ["endpoint"], | ||
| registry=CollectorRegistry() # Isolated registry |
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Typically we recommend not assigning any registry when using multiprocess. What about just leaving a comment here like # do not assign registry= when using multiprocess mode instead of assigning?
| CPU_USAGE = Gauge( | ||
| "system_cpu_usage_percent", | ||
| "Current CPU utilization percentage (aggregated)", | ||
| multiprocess_mode='livesum' # Critical for worker aggregation |
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Not critical for an example, but livemostrecent is probably the best here to avoid counting the CPU used multiple times.
| ``` | ||
| 2. **Storage Management** | ||
| - Use dedicated volume for `PROMETHEUS_MULTIPROC_DIR` | ||
| - Implement cleanup cron job: |
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Rather than a cron-job it is usually best practice to delete the data (if it exists) when your service restarts. Otherwise some problems with counter resets can occur.
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Description
This PR adds documentation for monitoring FastAPI applications running with Uvicorn ASGI server.