Prefect insights

Open SourceVersions: []22 metrics

OpenTelemetry·Native·

Long-running tasks monopolize worker resources and block concurrencywarning

prefect.task_run.duration prefect.flow_run.duration prefect.database.connections.active

linen.prefect.io

3mo ago▸

Worker pods incur orchestration overhead in Kubernetes work pools

prefect.work_pool.workers.active prefect.server.api.request.duration

linen.prefect.io

3mo ago▸

Insufficient CPU or memory allocation causes worker and server pod overwhelm

linen.prefect.io

3mo ago▸

Flow run status page causes CPU saturation due to canvas renderingwarning

8mo ago▸

task_runs/count API endpoint timeout prevents UI renderingwarning

prefect.server.api.request.duration prefect.task_run.count

8mo ago▸

Flow Run Parameters page causes 100% CPU load without renderingwarning

8mo ago▸

Runs page load time increases to 10+ seconds after Prefect 3 upgradewarning

prefect.server.api.request.duration

8mo ago▸

Tasks stuck in Running state with task.submit() pattern cause flow hangscritical

prefect.task_run.duration prefect.flow_run.duration prefect.task_run.count

10mo ago▸

Pydantic MockValSer serialization error prevents container flow startup

prefect.flow_run.crash

10mo ago▸

Runner AttributeError prevents cleanup after successful flow completion

10mo ago▸

Flow run heartbeat events delayed until run completionwarning

prefect.agent.heartbeat

11mo ago▸

Events duplicated when emit_event used outside flow run contextwarning

11mo ago▸

Database connection pool exhaustion causes severe API slowdown after Prefect 3.x upgrade

prefect.server.api.request.duration prefect.database.connections.active prefect.database.query.duration

11mo ago▸

Background scheduler services exceed loop intervals under database contentionwarning

11mo ago▸

SELECT FOR UPDATE queries on flow_run table block for multiple seconds despite indexing

prefect.database.query.duration

11mo ago▸

PostgreSQL deadlocks cause API 500 errors under concurrent load

11mo ago▸

Task run count API endpoint blocks UI with millions of task runs

prefect.task_run.count

11mo ago▸

Database vacuum service disabled by default allows performance-degrading data accumulation

11mo ago▸

Database deadlock on concurrent task_run inserts

prefect.database.connections.active prefect.task_run.count prefect.database.query.duration

11mo ago▸

CancellationCleanup service execution exceeds loop intervalwarning

prefect.database.query.duration

11mo ago▸

RecentDeploymentsScheduler execution exceeds loop intervalwarning

prefect.database.query.duration prefect.deployment.run_count

11mo ago▸

MarkLateRuns service execution exceeds loop intervalwarning

prefect.flow_run.late prefect.database.query.duration prefect.flow_run.count

11mo ago▸

Tag concurrency limit deadlock with dependent tasks in Prefect 3.2.15+critical

prefect.task_run.count prefect.flow_run.duration

1y ago▸

PostgreSQL connection pool exhaustion causes Prefect server errors and worker crashes

prefect.database.connections.active prefect.work_pool.workers.active prefect.flow_run.crash

1y ago▸

Worker exits unexpectedly when API server returns HTTP 500

prefect.flow_run.crash prefect.work_pool.workers.active prefect.server.api.requests

1y ago▸

Flow runs stuck in PENDING state after worker crash

prefect.flow_run.late prefect.work_queue.late_runs prefect.deployment.status

1y ago▸

API server overload at high scale causes HTTP 500 errors

prefect.server.api.request.duration prefect.server.api.requests prefect.flow_run.count+1 more

1y ago▸

Prefect server startup fails with individual database configuration parameterscritical

1y ago▸

Ghost runs persist when runners die without server notification

prefect.flow_run.crash prefect.agent.heartbeat

1y ago▸

Dead workers block concurrency slots indefinitelywarning

prefect.work_queue.depth

1y ago▸