Based on my research, here's what you need to know about configuring work queues in deployment YAML files: 1. You can specify different work queues for different deployments within the same YAML file. Here's an example:

yaml
deployments:
  - name: deployment-1
    entrypoint: your_flow.py:your_flow
    work_pool:
      name: your-work-pool
      work_queue_name: queue-1

  - name: deployment-2
    entrypoint: your_flow.py:your_flow
    work_pool:
      name: your-work-pool
      work_queue_name: queue-2

2. Each deployment can target a specific work queue within the work pool using the

work_queue_name

parameter. 3. If no work queue is specified, the deployment will use the default work queue of the work pool. Important notes: - Work queues must already exist in the work pool before they can be referenced in deployments - You cannot create new work queues directly through the deployment YAML - Each deployment can only target one work queue at a time - Different deployments can use different work queues, even within the same work pool For more information about deployment configuration and work queues, you can refer to: - Prefect YAML Configuration Guide - Work Pools Concept Documentation Would you like to know more about creating work queues within work pools or managing them through the CLI?

Based on my research, here's how you can define concurrency and priority in Prefect 3.x: 1. In the deployment YAML:

yaml
deployments:
  - name: my-deployment
    entrypoint: flow.py:my_flow
    work_pool:
      name: my-pool
      work_queue_name: my-queue
    is_schedule_active: true
    tags:
      - concurrency-tag  # Can be used for tag-based concurrency limits

2. Setting Work Queue Priority and Concurrency: You can set these when creating a work queue using the CLI:

bash
prefect work-queue create "my-queue" --pool "my-pool" --priority 1 --limit 5

- Priority: Lower numbers = higher priority (e.g., 1 is higher priority than 10) - Limit: Maximum number of concurrent flow runs 3. Setting Work Pool Concurrency:

bash
prefect work-pool set-concurrency-limit "my-pool" 10

4. Global Concurrency Limits: You can also set global concurrency limits based on tags:

bash
prefect concurrency-limit create "my-limit" --tag "concurrency-tag" --value 3

Important notes about concurrency and priority: 1. Concurrency Limits: - Work pool limits apply to all queues within that pool - Queue-specific limits can't exceed their parent work pool's limit - Global concurrency limits (based on tags) take precedence - A value of 0 or null means no limit 2. Priority: - Priority only affects ordering within a single work queue - Lower numbers indicate higher priority (1 is highest priority) - Flows with the same priority are executed in FIFO order - If not specified, default priority is used 3. Hierarchy:

Global Concurrency Limits
       ↓
Work Pool Limits
       ↓
Work Queue Limits

You can manage these settings through: - Prefect UI - CLI commands (as shown above) - Prefect API Would you like more specific examples for any of these configurations or information about monitoring concurrent runs?

Based on my research, I can now provide a clearer answer about setting concurrency and priority in the YAML configuration. While you can't set the concurrency limit and priority directly in the deployment YAML for a work queue (these are properties of the work queue itself), you can specify which work queue to use and its characteristics. Here's how it works: 1. Basic Work Queue Configuration in YAML:

yaml
deployments:
  - name: my-deployment
    work_pool:
      name: my-pool
      work_queue_name: my-queue  # References an existing queue

2. For Concurrency and Priority: You have two options: a) Pre-create the work queue with desired settings using the CLI:

bash
prefect work-queue create "my-queue" --pool "my-pool" --limit 5 --priority 1

Then reference it in your YAML as shown above. b) Use the Prefect API to programmatically set these values before or after deployment. The reason these settings aren't directly configurable in the YAML is that concurrency limits and priority are properties of the work queue itself, not the deployment. This design allows multiple deployments to share the same work queue while maintaining consistent concurrency and priority settings. If you're looking to control concurrency at the flow level, you can use: - Tag-based concurrency limits - Task-level concurrency limits using the

@task(concurrency_limit=N)

decorator - Flow-level concurrency limits using the

@flow(concurrency_limit=N)

decorator Would you like me to provide more information about any of these alternative approaches to managing concurrency?

You make an excellent point. There doesn't seem to be a technical reason why these settings couldn't be defined in the YAML, and it would certainly make configuration more declarative and easier to version control. The current separation between deployment configuration and queue settings creates extra steps in the deployment process. Here's what you could do: 1. Open a Feature Request: You could open a feature request on the Prefect GitHub repository suggesting something like:

yaml
deployments:
  - name: my-deployment
    work_pool:
      name: my-pool
      work_queue:
        name: my-queue
        concurrency_limit: 5
        priority: 1

This would be a more intuitive and GitOps-friendly way to manage these settings. 2. Current Workaround: In the meantime, you could create a deployment script that: - First creates/updates the work queue with desired settings - Then applies the deployment YAML Example:

python
from prefect.client import get_client
async def setup_deployment():
    client = get_client()
    # Create/update work queue with settings
    await client.create_work_queue(
        name="my-queue",
        work_pool_name="my-pool",
        concurrency_limit=5,
        priority=1
    )
    # Then run deployment
    subprocess.run(["prefect", "deploy"])

Would you like me to help you craft a feature request for this functionality, or would you prefer to explore alternative approaches to managing these settings in your current workflow?