> ## Documentation Index
> Fetch the complete documentation index at: https://docs.prefect.io/llms.txt
> Use this file to discover all available pages before exploring further.
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# Infrastructure events
> Events emitted for blocks, deployment pull steps, workspace transfers, and integration infrastructure (Docker, Kubernetes, ECS).
Infrastructure events cover block loading, deployment pull step execution,
workspace resource transfers, and infrastructure status tracking from integration
packages. For more on blocks, see [Blocks](/v3/concepts/blocks).
## Block events
### `prefect.block.{type}.loaded`
Emitted when a block is loaded from the server. The `{type}` portion is the
block type slug (for example, `prefect.block.slack-webhook.loaded` or
`prefect.block.s3-bucket.loaded`).
#### Resource
| Label | Description |
| ----------------------- | ------------------------------- |
| `prefect.resource.id` | `prefect.block-document.{uuid}` |
| `prefect.resource.name` | Block document name |
#### Related resources
| Resource ID pattern | Role | When present |
| --------------------------- | ------------ | ------------ |
| `prefect.block-type.{slug}` | `block-type` | Always |
#### Payload
This event has no payload.
Block subclasses can override the `_event_method_called_resources()` method to
customize the resource and related resources for their events.
## Deployment pull step events
### `prefect.flow-run.pull-step.executed`
Emitted when a deployment pull step completes successfully during flow run
infrastructure setup.
#### Resource
| Label | Description |
| --------------------- | ------------------------- |
| `prefect.resource.id` | `prefect.flow-run.{uuid}` |
#### Related resources
| Resource ID pattern | Role | When present |
| --------------------------- | ------------ | ---------------------------- |
| `prefect.deployment.{uuid}` | `deployment` | When the deployment is known |
#### Payload
The payload contains the serialized step definition (the step's fully qualified
name and its input parameters as defined in `prefect.yaml`).
### `prefect.flow-run.pull-step.failed`
Emitted when a deployment pull step fails during flow run infrastructure setup.
#### Resource
Same as [`prefect.flow-run.pull-step.executed`](#prefectflow-runpull-stepexecuted).
#### Related resources
Same as [`prefect.flow-run.pull-step.executed`](#prefectflow-runpull-stepexecuted).
#### Payload
Same as [`prefect.flow-run.pull-step.executed`](#prefectflow-runpull-stepexecuted).
## Workspace transfer events
### `prefect.workspace.transfer.started`
Emitted when a workspace-to-workspace resource transfer begins (via `prefect
transfer`).
#### Resource
| Label | Description |
| ----------------------- | --------------------------------------------------------------------------------- |
| `prefect.resource.id` | `prefect.workspace.transfer.{uuid}` |
| `prefect.resource.name` | Description of the transfer direction (for example, `local → cloud/my-workspace`) |
#### Related resources
This event has no related resources.
#### Payload
| Field | Type | Description |
| ----------------- | ------- | ------------------------------------- |
| `source_profile` | string | Name of the source Prefect profile |
| `target_profile` | string | Name of the target Prefect profile |
| `source_url` | string | API URL of the source |
| `target_url` | string | API URL of the target |
| `total_resources` | integer | Total number of resources to transfer |
### `prefect.workspace.transfer.completed`
Emitted when a workspace transfer completes.
#### Resource
Same as [`prefect.workspace.transfer.started`](#prefectworkspacetransferstarted).
#### Related resources
This event has no related resources.
#### Payload
| Field | Type | Description |
| ----------------- | ------- | -------------------------------------------- |
| `source_profile` | string | Name of the source Prefect profile |
| `target_profile` | string | Name of the target Prefect profile |
| `source_url` | string | API URL of the source |
| `target_url` | string | API URL of the target |
| `total_resources` | integer | Total number of resources transferred |
| `succeeded` | integer | Number of resources transferred successfully |
| `failed` | integer | Number of resources that failed to transfer |
| `skipped` | integer | Number of resources skipped |
## Integration infrastructure events
The following events are emitted by Prefect integration packages to track
infrastructure status changes during flow run execution. Each requires the
respective integration package to be installed.
### Docker events (prefect-docker)
The Docker worker emits events when container status changes during flow run
execution.
#### `prefect.docker.container.{status}`
Emitted when a Docker container's status changes. Events are chained using the
`follows` field to track status progression.
##### Status variants
| Event name | Description |
| ------------------------------------- | ---------------------------- |
| `prefect.docker.container.created` | Container has been created |
| `prefect.docker.container.running` | Container is running |
| `prefect.docker.container.paused` | Container is paused |
| `prefect.docker.container.restarting` | Container is restarting |
| `prefect.docker.container.removing` | Container is being removed |
| `prefect.docker.container.exited` | Container has exited |
| `prefect.docker.container.dead` | Container is in a dead state |
##### Resource
| Label | Description |
| ----------------------- | ----------------------------------------- |
| `prefect.resource.id` | `prefect.docker.container.{container-id}` |
| `prefect.resource.name` | Container name |
##### Related resources
| Resource ID pattern | Role | When present |
| --------------------------- | ------------ | ---------------------------------------------- |
| `prefect.flow-run.{uuid}` | `flow-run` | When available from worker configuration |
| `prefect.flow.{uuid}` | `flow` | When available |
| `prefect.deployment.{uuid}` | `deployment` | When available |
| `prefect.work-pool.{uuid}` | `work-pool` | When the worker is attached to a work pool |
| Worker resource | `worker` | Always (the worker that manages the container) |
##### Payload
This event has no payload.
#### `prefect.docker.container.creation-failed`
Emitted when a Docker container fails to be created. Same resource and related
resources as `prefect.docker.container.{status}`.
### Kubernetes events (prefect-kubernetes)
The Kubernetes observer emits events when pod phase changes are detected for pods
labeled with `prefect.io/flow-run-id`.
#### `prefect.kubernetes.pod.{phase}`
Emitted when a Kubernetes pod transitions to a new phase. Events use deterministic
IDs based on the pod UID, phase, and restart count for deduplication. Events
within 5 minutes of each other are chained using the `follows` field.
##### Phase variants
| Event name | Description |
| ---------------------------------- | ----------------------------- |
| `prefect.kubernetes.pod.pending` | Pod is in the Pending phase |
| `prefect.kubernetes.pod.running` | Pod is in the Running phase |
| `prefect.kubernetes.pod.succeeded` | Pod completed successfully |
| `prefect.kubernetes.pod.failed` | Pod terminated with an error |
| `prefect.kubernetes.pod.unknown` | Pod is in an unknown state |
| `prefect.kubernetes.pod.evicted` | Pod was evicted from the node |
##### Resource
| Label | Description |
| ----------------------- | --------------------------------------- |
| `prefect.resource.id` | `prefect.kubernetes.pod.{uid}` |
| `prefect.resource.name` | Pod name |
| `kubernetes.namespace` | Kubernetes namespace |
| `kubernetes.reason` | Eviction reason (only for evicted pods) |
##### Related resources
| Resource ID pattern | Role | When present |
| --------------------------- | ------------ | ------------------------------------------------------------------------------------------- |
| `prefect.flow-run.{uuid}` | `flow-run` | Always (from `prefect.io/flow-run-id` pod label) |
| `prefect.deployment.{uuid}` | `deployment` | When `prefect.io/deployment-id` pod label is set |
| `prefect.flow.{uuid}` | `flow` | When `prefect.io/flow-id` pod label is set |
| `prefect.work-pool.{uuid}` | `work-pool` | When `prefect.io/work-pool-id` pod label is set |
| Worker name | `worker` | When `prefect.io/worker-name` pod label is set (includes `prefect.worker-type: kubernetes`) |
##### Payload
This event has no payload.
```json theme={null}
{
"occurred": "2026-03-31T18:30:00.000000Z",
"event": "prefect.kubernetes.pod.running",
"resource": {
"prefect.resource.id": "prefect.kubernetes.pod.a1b2c3d4-e5f6-7890-abcd-ef1234567890",
"prefect.resource.name": "prefect-flow-run-abc123",
"kubernetes.namespace": "prefect"
},
"related": [
{
"prefect.resource.id": "prefect.flow-run.e3755d32-cec5-42ca-9bcd-af236e308ba6",
"prefect.resource.role": "flow-run"
},
{
"prefect.resource.id": "prefect.work-pool.c3d4e5f6-a7b8-9012-cdef-123456789012",
"prefect.resource.role": "work-pool"
},
{
"prefect.resource.id": "my-k8s-worker",
"prefect.resource.role": "worker",
"prefect.worker-type": "kubernetes"
}
],
"id": "b890c123-4567-89ab-cdef-0123456789ab",
"follows": "a7890123-bcde-f456-7890-123456789abc"
}
```
### AWS ECS events (prefect-aws)
The ECS observer emits events when ECS task status changes are detected via SQS
for tasks tagged with `prefect.io/flow-run-id`.
#### `prefect.ecs.task.{status}`
Emitted when an ECS task transitions to a new status. Events use the AWS
EventBridge event UUID for deterministic tracking. Events within 5 minutes of each
other are chained using the `follows` field.
##### Status variants
| Event name | Description |
| --------------------------------- | ---------------------------------------------------- |
| `prefect.ecs.task.provisioning` | Task resources are being provisioned |
| `prefect.ecs.task.pending` | Task is waiting to be placed on a container instance |
| `prefect.ecs.task.activating` | Task is being activated |
| `prefect.ecs.task.running` | Task is running |
| `prefect.ecs.task.deactivating` | Task is being deactivated |
| `prefect.ecs.task.stopping` | Task is being stopped |
| `prefect.ecs.task.deprovisioning` | Task resources are being deprovisioned |
| `prefect.ecs.task.stopped` | Task has stopped |
| `prefect.ecs.task.deleted` | Task has been deleted |
##### Resource
| Label | Description |
| ----------------------- | ---------------------------------------- |
| `prefect.resource.id` | `prefect.ecs.task.{task-id}` |
| `ecs.taskArn` | Full ECS task ARN |
| `ecs.clusterArn` | ECS cluster ARN (when available) |
| `ecs.taskDefinitionArn` | ECS task definition ARN (when available) |
##### Related resources
| Resource ID pattern | Role | When present |
| --------------------------- | ------------ | ----------------------------------------------------------------------------------- |
| `prefect.flow-run.{uuid}` | `flow-run` | Always (from `prefect.io/flow-run-id` task tag) |
| `prefect.deployment.{uuid}` | `deployment` | When `prefect.io/deployment-id` task tag is set |
| `prefect.flow.{uuid}` | `flow` | When `prefect.io/flow-id` task tag is set |
| `prefect.work-pool.{uuid}` | `work-pool` | When `prefect.io/work-pool-id` task tag is set |
| Worker name | `worker` | When `prefect.io/worker-name` task tag is set (includes `prefect.worker-type: ecs`) |
##### Payload
This event has no payload.
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