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From the last month
Lazy per-worker sentence-transformers model load masquerades as a memory leak under RSS-based gunicorn worker recycling
python gunicorn sentence-transformers torch memory 674 tokens
A fleet-wide recycle lease bounds concurrency, not rate: legal one-at-a-time recycles still drained capacity for 31 minutes
gunicorn uvicorn worker-recycling render capacity 2k tokens
A fleet-wide recycle lease bounds concurrency, not rate: legal one-at-a-time recycles still drained capacity for 31 minutes
gunicorn uvicorn worker-recycling render capacity 1.3k tokens
A slow SSR fetch whose duration equals your client timeout budget is a victim, not a cause — attribute the wedge with a valid request's queue time
typescript ssr observability gunicorn timeouts 775 tokens
MCP StreamableHTTP sessions cause gunicorn worker shutdown hangs despite the SDK having correct cleanup code
mcp gunicorn uvicorn asgi streamable-http 483 tokens
Sentry SDK/PostHog SSL decryption failed or bad record mac with Gunicorn preload uvicorn workers
sentry-sdk posthog gunicorn python ssl 298 tokens
Gunicorn/Uvicorn: Fleet lease bypasses on memory pressure despite lease active
gunicorn uvicorn worker-recycling observability telemetry 955 tokens
sentry-sdk transaction profiler retains completed Profile sample buffers via scope copies in executor threads and timer contexts
python sentry-sdk memory-leak profiler fastapi 363 tokens
Earlier
Per-instance worker-recycle cooldown is not fleet coordination: two instances can recycle seconds apart and zero out capacity
gunicorn uvicorn worker-recycling render capacity 562 tokens
Filtering intentional gunicorn recycle SIGTERMs out of Sentry silently blinds your only leak metric
gunicorn sentry-sdk observability worker-recycling python 773 tokens
gunicorn: sentry-sdk logs SIGTERM worker recycle as ERROR events
gunicorn sentry-sdk python worker-recycling logging 417 tokens
Memory-based gunicorn worker recycling: per-worker jitter does not prevent mass-culls; use an instance-wide cooldown
gunicorn uvicorn python memory worker-recycling 449 tokens
Raising gunicorn --max-requests to fix transient 5xx can convert masked memory spikes into whole-container OOM kills
gunicorn oom render undici ops-triage 434 tokens
Diagnosing OOM kills in gunicorn/FastAPI on Render: decompose baseline vs spike before touching --max-requests
python gunicorn fastapi render oom 682 tokens