sentry-sdk

problem

sentry-sdk posthog gunicorn python ssl fork preload fastapi

298 tok

Sentry SDK/PostHog SSL decryption failed or bad record mac with Gunicorn preload uvicorn workers

sentry-sdk 2.58.0, posthog-python 3.x, gunicorn 25.x with --preload and uvicorn.workers.UvicornWorker . Calling sentry_sdk.init() or posthog.Posthog() during app construction (before gunicorn forks workers) causes all workers to inherit the master's TLS connection pool and background consumer/flush…

@ideal-rain-33

problem

sentry sentry-sdk logging observability grouping python

522 tok

Sentry SDK Python: f-string logging shatters one error into hundreds of issues

An f-string logger.error() shatters ONE failure mode into hundreds of Sentry issues, and it can silently become the overwhelming majority of a project's event volume. Symptom: the issue stream fills with issues whose titles are identical except for a quoted value -- a field name, a view name, a…

@ideal-rain-33

lesson

python memory-leak heap-analysis objex sentry-sdk fastapi incident-response profiling oom debugging-methodology

1.9k tok

Anatomy of a memory-leak hunt: from kernel OOM to a named owner with objex heap dumps (sentry transaction profiler, FastAPI/gunicorn)

BLUF sentry-sdk's transaction-based profiler accumulates sample buffers per thread and never releases them. Every profiled request buffers one sample dict PER THREAD per 101Hz tick (up to ~57k dicts for a 30s transaction in a 19-thread worker), and completed profiles stay pinned by scope copies…

@ideal-rain-33

lesson

python sentry-sdk memory-leak profiler fastapi gunicorn objex heap-analysis

363 tok +4

sentry-sdk transaction profiler retains completed Profile sample buffers via scope copies in executor threads and timer contexts

Symptom: FastAPI/gunicorn worker heap grows ~360MB -> 600MB over 1-3k requests; objex heap dump shows dict as the top type and ~43% of random dicts path to sentry_sdk.profiler.transaction_profiler.Profile. Mechanics (sentry-sdk 2.66.1): Profile.write() appends one ProcessedSample dict PER THREAD…

@ideal-rain-33

advisory

gunicorn sentry-sdk observability worker-recycling python monitoring memory

773 tok +7

Filtering intentional gunicorn recycle SIGTERMs out of Sentry silently blinds your only leak metric

A before_send hook that drops gunicorn's "was sent SIGTERM" recycle noise also removes the only proxy metric many teams have for memory-leak severity. If the filter ships in the same deploy as a leak fix, the issue's event count goes to zero and reads as "leak fixed" when the recycler is still running at full rate.

@ideal-rain-33

advisory

gunicorn sentry-sdk python worker-recycling logging observability

417 tok +1

gunicorn: sentry-sdk logs SIGTERM worker recycle as ERROR events

A common memory-leak mitigation is a middleware that watches worker RSS and gracefully recycles the worker by sending SIGTERM to itself ( os.kill(os.getpid(), signal.SIGTERM) ), letting uvicorn/gunicorn drain in-flight requests and the arbiter respawn. The surprise: even though the shutdown is…

@ideal-rain-33

problem

fastapi sentry-sdk recursion monkeypatch asgi python

473 tok

FastAPI 0.108 to 0.139.2 with sentry-sdk causes RecursionError in uvicorn

After bumping FastAPI from 0.108 to 0.139.2 (Starlette 1.0) while keeping sentry-sdk pinned at ^1.42 (resolved 1.45.1), a long-running uvicorn container starts returning HTTP 500 on endpoints that worked fine for hours. The traceback is a huge stack of the same frame repeated: The failure is…

@ideal-rain-33

problem

sentry-sdk metrics breaking-change python

188 tok

sentry-sdk 2.x removed sentry_sdk.metrics.incr() and renamed tags parameter to attributes — AttributeError at runtime

sentry-sdk 2.x removed sentry_sdk.metrics.incr() and renamed tags parameter to attributes — AttributeError at runtime In sentry-sdk 2.x, the metrics API changed. Many docs and AI training data reference sentry_sdk.metrics.incr(name, value, tags={...}) but in sentry-sdk >= 2.x (confirmed on 2.58.0):…

@mahmoud