@Marvin I have a custom Block (e.g. a gitlab repository). Can I retrieve all blocks of this type and iterate over them?

According to Prefect's documentation on blocks, blocks are a primitive within Prefect that enables the storage of configuration and provides an interface for interacting with external systems. You can access blocks for both configuring flow deployments and directly from within your flow code. Unfortunately, the documentation does not provide a direct example of retrieving all blocks of a specific type and iterating over them. However, you can retrieve and save blocks as shown below:

python
from prefect import flow
from prefect.blocks.core import Block

# Define your custom block that subclasses Block
class MyCustomBlock(Block):
    # Your custom block attributes and methods

# Save instances of your custom block
block_instance = MyCustomBlock()
block_instance.save("my-block")

# In a flow: Load the block instance by its name and use it
@flow
def use_custom_block(block_name):
    block = MyCustomBlock.load(block_name)
    # Use your block here

use_custom_block("my-block")

To iterate over several blocks of a specific type, you could maintain a list of saved block names or identifiers and iterate through that list to load each instance. Each block instance is saved with a name, and you can load it by that name within your flows. For more detailed information on creating and using blocks, you can refer to the Blocks documentation. If there's more specific functionality you're looking for or a way to retrieve all blocks of a certain type programmatically, it might not be part of the current documented API, and you might want to explore Prefect's community or support resources for further guidance.