Hi, I wonder whether it is possible to set dynamic context / environment variables during flow runs? (This context is only known at run time)

Hey @Dan Zhao, how big is it? Maybe you can use the KV Store to store it? There is a 10 KB limit, maybe you can hold it there. Are parameters not a good use for this?

it's just some strings and integers - but it's related to the executing environment (e.g. available RAM)

Do you have access to it in the Python process? And you want to load them and then add them to context?

yes to both questions.

Gotcha so not 100% this will work but maybe you can store the Flow as a script, and then at the top, do

get_env_vars_somehow()
os.environ = new_env_vars #using the context

import prefect

so that when prefect gets imported and the context gets created, the env vars will exist. does that make sense? kind of a hack though and I think the KV Store might be the cleaner approach