I am new user of Prometheus and I instrumented my fastapi application with
it. But I get an exception ValueError: Duplicated timeseries in
CollectorRegistry
exception.
My code looks like following:
app = FastAPI(title="billing-service")
instrumentator = Instrumentator(
excluded_handlers=[
],
)
instrumentator.instrument(app)
instrumentator.expose(app, include_in_schema=False)
app.include_router(xxxx)
app.include_router(xxxx)
app.include_router(xxxx)
app.include_router(xxxx)
@app.exception_handler(RequestValidationError)
async def validation_exception_handler(
request: Request, exc: RequestValidationError
) -> JSONResponse:
# some code
return await request_validation_exception_handler (request, exc)
@app.exception_handler(HTTPException)
async def custom_http_exception_handler(
request: Request, exc: HTTPException
) -> JSONResponse:
# some code
return await http_exception_handler(request, exc)
When I remove these exception handlers from app then everything work fine
but when I add these exception handlers, Prometheus raise the following
exception:
File "/app/app/main.py", line 113, in <module>
async def custom_http_exception_handler(
File "/usr/local/lib/python3.8/site-packages/starlette/applications.py",
line 161, in decorator
self.add_exception_handler(exc_class_or_status_code, func)
File "/usr/local/lib/python3.8/site-packages/starlette/applications.py",
line 135, in add_exception_handler
self.middleware_stack = self.build_middleware_stack()
File "/usr/local/lib/python3.8/site-packages/fastapi/applications.py",
line 186, in build_middleware_stack
app = cls(app=app, **options)
File
"/usr/local/lib/python3.8/site-packages/prometheus_fastapi_instrumentator/middleware.py",
line 52, in __init__
self.instrumentations = instrumentations or [metrics.default()]
File
"/usr/local/lib/python3.8/site-packages/prometheus_fastapi_instrumentator/metrics.py",
line 544, in default
TOTAL = Counter(
File
"/usr/local/lib/python3.8/site-packages/prometheus_client/metrics.py", line
143, in __init__
registry.register(self)
File
"/usr/local/lib/python3.8/site-packages/prometheus_client/registry.py",
line 43, in register
raise ValueError(
ValueError: Duplicated timeseries in CollectorRegistry:
{'http_requests_created', 'http_requests_total', 'http_requests'}
The line of code which causes the problem is exactly the line which first
exception handler is added to fastapi app.
--
You received this message because you are subscribed to the Google Groups
"Prometheus Users" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To view this discussion on the web visit
https://groups.google.com/d/msgid/prometheus-users/90f8fbba-7084-4745-942a-2d32a6d19a0cn%40googlegroups.com.
