Not on Cloud Run, though you can do this on Cloud Run on GKE.
There are some interesting billing implications of persistent connections (e.g. we don't know what's going on in that session [if there's traffic or not]), so we'll likely have to bill you the entire time the connection is open.
There are some interesting billing implications of persistent connections (e.g. we don't know what's going on in that session [if there's traffic or not]), so we'll likely have to bill you the entire time the connection is open.