Hello. I am new to Pulumi. I have a question. Do I need to restart Azure Function Apps manually after the redeployment of the stack via Pulumi?

I don't think so, no, unless it's not updating while other dependent systems are. Are you running into an error?

No. I have no errors. But when I call the http trigger older version of it is called. Only when I restart an azure function app I see the updates

Ah, yes, that's definitely a possibility; we build directly off of Azure's resource models if you're using the native provider, so any known update concerns on Azure would still happen. You could send that POST request as part of your Pulumi program, though, so it updates automatically.