API Rate Limits & Retention Periods ¶
API rate limits restrict the number of requests that a single client can make in a given time period. They ensure Prefect Cloud's stability, so that when you make an API call, you always get a response.
Prefect Cloud rate limits are subject to change
The following rate limits are in effect currently, but are subject to change. Contact Prefect support at help@prefect.io if you have questions about current rate limits.
Prefect Cloud enforces the following rate limits:
- Flow and task creation rate limits
- Log service rate limits
Flow, flow run, and task run rate limits¶
Prefect Cloud limits the flow_runs, task_runs, and flows endpoints and their subroutes at the following levels:
- 400 per minute for personal accounts
- 2,000 per minute for Pro accounts
The Prefect Cloud API will return a 429 response with an appropriate Retry-After header if these limits are triggered.
Log service rate limits¶
Prefect Cloud limits the number of logs accepted:
- 700 logs per minute for personal accounts
- 10,000 logs per minute for Pro accounts
The Prefect Cloud API will return a 429 response if these limits are triggered.
Flow run retention¶
Prefect Cloud feature
The Flow Run Retention Policy setting is only applicable in Prefect Cloud.
Flow runs in Prefect Cloud are retained according to the Flow Run Retention Policy set by your account tier. The policy setting applies to all workspaces owned by the account.
The flow run retention policy represents the number of days each flow run is available in the Prefect Cloud UI, and via the Prefect CLI and API after it ends. Once a flow run reaches a terminal state (detailed in the chart here), it will be retained until the end of the flow run retention period.
Flow Run Retention Policy keys on terminal state
Note that, because Flow Run Retention Policy keys on terminal state, if two flows start at the same time, but reach a terminal state at different times, they will be removed at different times according to when they each reached their respective terminal states.
This retention policy applies to all details about a flow run, including its task runs. Subflow runs follow the retention policy independently from their parent flow runs, and are removed based on the time each subflow run reaches a terminal state.
If you or your organization have needs that require a tailored retention period, contact the Prefect Sales team.