Technologies/Grafana/gunicorn.exceptions
GrafanaGrafanaMetric

gunicorn.exceptions

Total exceptions during request processing
Dimensions:None

Technical Annotations (47)

Configuration Parameters (11)
--error-logfilerecommended: /var/log/gunicorn/error.log
enables detailed error logging for startup failures
--preloadrecommended: enabled
loads application code before forking workers to detect import and initialization errors
scrape_configs.job_namerecommended: django_app
Identifier for the Django application scrape job in Prometheus
scrape_configs.static_configs.targetsrecommended: ['localhost:8000']
Target endpoint(s) for Prometheus to scrape Django/Gunicorn metrics
max_requestsrecommended: 1000
recycles workers after N requests to prevent long-running logging issues
max_requests_jitterrecommended: 100
adds randomness to worker recycling to avoid thundering herd
workersrecommended: 4
reduce worker count to limit concurrent stderr writes during peak hours
PROPAGATE_EXCEPTIONSrecommended: True
Flask config to enable exception propagation to Gunicorn logs
disable_existing_loggersrecommended: False
Top-level key in Django LOGGING dict; prevents disabling Gunicorn's handlers
proxy_http_versionrecommended: 1.1
Ensures proper HTTP/1.1 handling at nginx proxy layer
proxy_set_header Connectionrecommended: ""
Prevents connection header issues in nginx proxy configuration
Error Signatures (11)
gunicorn.errors.HaltServer: <HaltServer 'Worker failed to boot.' 3>exception
Worker failed to boot.log pattern
Worker failed to booterror code
status=500http status
RuntimeError: reentrant call inside <_io.BufferedWriter name='<stderr>'>exception
Worker with pid [0-9]+ was terminated due to signal 9log pattern
9error code
Worker with pid %s was terminated due to signal %slog pattern
gunicorn.errors.HaltServer: <HaltServer 'worker failed to boot.' 3>exception
ImportError: No module namedexception
400http status
CLI Commands (4)
gunicorn app:app --error-logfile /var/log/gunicorn/error.log --access-logfile /var/log/gunicorn/access.log --preloaddiagnostic
gunicorn app:app --workers=4 --max-requests=1000 --max-requests-jitter=100remediation
gunicorn myapp:server --bind localhost:8000 -chdir /path/to/project --workers 2diagnostic
pip install mymoduleremediation
Technical References (21)
HaltServerexceptionWORKER_BOOT_ERRORerror codehttp_requests_totalcomponentrate()conceptscrape_configscomponentstatic_configscomponentstderrfile pathSIGKILLconceptlogging deadlockconceptgunicorn.arbitercomponentPROPAGATE_EXCEPTIONScomponentFlask endpointcomponent@server.errorhandlercomponentlogging.config.dictConfigcomponentLOGGING dictionaryconceptTransfer-EncodingprotocolRFC 7230protocolCWE-444conceptchunked encodingprotocolgthread workercomponentissue #1976concept
Related Insights (13)
Application code errors prevent Gunicorn worker startupcritical
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Syntax errors or exceptions in application code prevent worker bootcritical
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Circular imports or improper module initialization cause boot failurescritical
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High HTTP 500 error rate triggers critical alertcritical
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Prometheus metrics scraping from Django applicationinfo
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Reentrant logging deadlock causes worker termination with SIGKILLcritical
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Gunicorn workers crash with reentrant logging errors causing intermittent downtimecritical
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Flask uncaught exceptions not logged by Gunicornwarning
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Flask error handlers not registered when defined in non-imported module with Gunicornwarning
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Gunicorn exceptions hidden when custom Django logging disables existing loggerscritical
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Module import errors prevent Gunicorn worker initializationcritical
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Transfer-Encoding header smuggling enables security bypasscritical
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gthread worker processes requests from closed connectionswarning
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