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prefect 3.6.19 - This release sucks in the best way possible

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This release introduces an optional database vacuum service that periodically deletes old flow runs and orphaned resources (logs, artifacts, artifact collections) to keep your database lean. It's disabled by default , enable it with PREFECT_SERVER_SERVICES_DB_VACUUM_ENABLED=true.

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Also shipped Feb 24, 2026Prefect in February 2026 →

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Prefect 3.6.20 - new cli, who dis?

Enhancements ➕➕ Migrate CLI from typer to cyclopts, remove toggle and delegation machinery Route ProcessPoolTaskRunner subprocess events and logs through a single parent queue, improving per-task performance by ~28% in log-heavy workloads Add configurable subprocess message processors to ProcessPoolTaskRunner for custom event/log handling in the parent...

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Prefect 3.6.18 - The annotation that minds its own business

Enhancements ➕➕ Add opaque annotation to prevent recursive traversal of resolved task inputs Add PREFECT_WORKER_DEBUG_MODE for worker-only debug logging Support DateTimeDelta as interval option in IntervalSchedule Bug Fixes 🐞 Include duration fields in TaskRunResponse Skip lease renewal and release when no concurrency limits exist Fix order-dependent slug...

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Prefect 3.6.21 - {"cli": { "speaks_json": true } }

Enhancements ➕➕ Add --output json support to flow ls command Fix match_related type hints and add Python examples for DeploymentEventTrigger Support multihost Postgres connection strings in LISTEN/NOTIFY listener Move event trimming from EventPersister to docket-based db_vacuum service Add --output json to task-run ls, work-pool ls, and concurrency-limit ls...

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Prefect 3.6.17 - Goodbye, Ghost in the WebSocket

New Features 🎉 Add prefect server status command Enhancements ➕➕ Make PrefectFutureList.result() fail-fast using as_completed Improve CLI connection message for self-hosted server Add replaces field for renaming schedule slugs Add attribution headers to SDK API requests Bug Fixes 🐞 Fix flow timeout not retrying when retries are enabled Fix the flow run...

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Prefect 3.6.22 - Actually, I've got triples of the pending

New Features 🎉 Add Submitting and InfrastructurePending states and emit from BaseWorker Add OS-level resource metric collection to flow run subprocesses Enhancements ➕➕ Add end_time filter support for flow and task runs Use hmac.compare_digest for auth token comparisons Use cyclopts native lazy loading for CLI commands Extend flow_run_logger to accept a...

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Prefect 3.6.16 - It's Bulking Season

New Features 🎉 Add prefect cloud asset list and delete commands Add bulk operation endpoints for flow runs, deployments, and flows Add SDK instrumentation module Enhancements ➕➕ Allow infra name templating with flow and flow_run Add max_scheduled_runs, parameters, and slug fields to deployment schedule methods Bug Fixes 🐞 Fix visit_collection to handle...

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Prefect 3.6.23 - Glob Trotter

Enhancements ➕➕ Skip no-op SQL filters for empty values to speed up deployment pagination Add --no-create-pool-if-not-found flag to worker start Emit events for deployment create, update, and delete operations Support glob patterns in events matching Support module path entrypoints in prefect.yaml deployments Add stream_progress_to parameter to DockerImage...

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Prefect 3.6.15 - Simply Authful

Bug Fixes 🐞 Fix PrefectCloudEventsClient auth handshake breaking Cloud connections Cap concurrency limit retry-after to prevent excessive delays from burst traffic

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