https://docs.dagster.io/deployment/overview
When Dagster is run, your code is served by dedicated “code server” processes separate from the daemon and webserver processes.
Depending on the context, these code servers will be spun up and down for you, and when they are spun down this is the message that is printed.
For example, if you were running
dagster dev
when you saw this, the code servers are restarted periodically to pick up any local code changes.